| **Summary of Significant Accounting Policies (Details) (USD $)Share data in Thousands, unless otherwise specified** | 12 Months Ended |            | 12 Months Ended |            |         |         |                                         |         |                  |                         | 12 Months Ended | 3 Months Ended            | 12 Months Ended           | 3 Months Ended | 12 Months Ended |           | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------|-----------------|------------|-----------------|------------|---------|---------|-----------------------------------------|---------|------------------|-------------------------|-----------------|---------------------------|---------------------------|----------------|-----------------|-----------|-----------------|
||
| **Revenue Recognition [Abstract]**                                                                                  |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Upfront license fee, received                                                                                       |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   | $ 60,000,000 |   | $ 58,400,000 |   |   | $ 1,100,000 | $ 500,000 | $ 15,000,000 |   |   | $ 3,500,000 |
| Upfront license fee, receivable                                                                                     |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   | 5,000,000 |   |
| Deferred Revenue                                                                                                    |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   | 3,000 | 673,000 |
| Additional license fees receivable upon achievement of development milestones                                       |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   | 20,000,000 |   |   |
| Collaboration Revenue                                                                                               | 8,525,000       | 76,764,000 | 1,413,000       |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   | 58,400,000 |   | 1,100,000 | 200,000 | 59,600,000 |   |   |   | 4,997,000 | 2,827,000 |
| **Shares of unvested restricted stock outstanding (in shares) [Line Items]**                                        |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Shares of unvested restricted stock outstanding (in shares)                                                         | 28              | 98         |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            | 28 | 98 | 341 |   |   |   |   |   |   |   |   |   |   |   |
| **Cash and Cash Equivalents [Line Items]**                                                                          |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Cash and cash equivalents                                                                                           | 58,838,000      | 70,105,000 | 47,918,000      | 90,903,000 |    |    |                                    |    |             |                    |            |                      |                      | 56,224,000     | 64,068,000      | 2,614,000 | 6,037,000       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Auction Rate Securities [Abstract]**                                                                              |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Auction rate securities                                                                                             | 3,240,000       | 3,332,000  |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Decrease in temporary impairment of auction rate securities                                                         | 8,000           |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Amount of temporary impairment                                                                                      | 260,000         | 268,000    |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Fair Value Measurements [Abstract]**                                                                              |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Other current assets                                                                                                | 1,692,000       | 919,000    |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Restricted cash                                                                                                     | 150,000         | 200,000    |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Estimated useful lives of fixed assets [Abstract]**                                                               |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Estimated useful life                                                                                               |            |       |            |       | 3 years | 5 years |                                    | 5 years | 8 years 6 months | 1 year 3 months 18 days | 7 years         | 10 years 9 months 18 days | 10 years 9 months 18 days |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Useful life description                                                                                             |            |       |            |       |    |    | Earlier of life of improvement or lease |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Deferred Lease Liability and Incentive [Abstract]**                                                               |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Deferred lease incentive                                                                                            | 115,000         | 115,000    |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total other current liabilities                                                                                     | 115,000         | 115,000    |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Deferred lease liability                                                                                            | 273,000         | 577,000    |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Deferred lease incentive                                                                                            | 805,000         | 920,000    |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total other liabilities                                                                                             | 1,078,000       | 1,497,000  |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Impairment of Long-Lived Assets [Abstract]**                                                                      |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Impairment loss                                                                                                     |            | $ 22,000   |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Income Taxes [Abstract]**                                                                                         |            |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Percentage of income tax benefit realization (in hundredths)                                                        | 50.00%          |       |            |       |    |    |                                    |    |             |                    |            |                      |                      |           |            |      |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Refers to receivable related to additional upfront payment of license fee upon achievement by party of its development milestones.
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| - Definition
The amount of compensation earned (contract income) under a research and development arrangement accounted for as a contract to perform research and development for others.
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Construction allowance from landlord amortized as a reduction of rental expense, current.
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| - Definition
This amount represents the increase in temporary impairment on the investments held by the entity. This could be due to decrease in value of investments.
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| - Definition
This item represents an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease. Used to reflect the noncurrent portion of the liabilities (due more than one year from the reporting date or one operating cycle, if longer.).
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| - Definition
Refers to percentage of income tax benefits likely of being realized upon ultimate settlement with a taxing authority.
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| - Definition
Description of useful life of long lived, physical assets used in the normal conduct of business and not intended for resale.
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| - Definition
Upfront license cash receivable from licensees.
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No definition available.
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| - Definition
The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
Amount of securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process.
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No definition available.
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| - Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.
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| - Definition
This element represents revenue received, but not recognized for financial reporting purposes, which is anticipated to be recognized for financial reporting purposes more than one year from the reporting date or one operating cycle, if longer. Such deferred revenue may consist of and include amounts paid in advance by lessees and purchase price adjustments for leases acquired in a business combination or other transaction and is net of the accumulated amortization of such amounts that to date have been recognized in revenue.
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).
+ References
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| - Definition
Cash received from licensees for license fees during the current period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
+ References
No definition available.
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| - Definition
The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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