| **Fair Value Measurements (Tables)**                                                     | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Fair Value Measurements [Abstract]**                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Assets measured at fair value on recurring basis                                         | The following tables present our money market funds, included in cash and cash equivalents, and auction rate securities assets and contingent consideration liability measured at fair value on a recurring basis as of the dates indicated, classified by valuation hierarchy:    Fair Value Measurements at December 31, 2013   Balance atDecember 31, 2013  Quoted Prices in Active Markets for Identical Assets(Level 1)  Significant Other Observable Inputs(Level 2)  Significant Unobservable Inputs(Level 3) Assets:        Money market funds $60,364  $60,364  $-  $- Auction rate securities  2,208   -   -   2,208 Total Assets $62,572  $60,364  $-  $2,208                  Liability:                Contingent consideration $15,700  $-  $-  $15,700 Total Liability $15,700  $-  $-  $15,700     Fair Value Measurements at December 31, 2012   Balance atDecember 31, 2012  Quoted Prices in Active Markets for Identical Assets(Level 1)  Significant Other Observable Inputs(Level 2)  Significant Unobservable Inputs(Level 3)          Money market funds $56,224  $56,224  $-  $- Auction rate securities  3,240   -   -   3,240 Total $59,464  $56,224  $-  $3,240  |
| Summary of activities in financial instruments with Level 3 inputs                       | For those financial instruments with significant Level 3 inputs, the following table summarizes the activities for the periods indicated:  Asset – Auction Rate SecuritiesFair Value Measurements Using SignificantUnobservable Inputs(Level 3) Description 2013  2012 Balance at beginning of period $3,240  $3,332 Transfers into Level 3  -   - Total realized/unrealized gains (losses)        Included in net income (loss)  -   - Included in comprehensive income (loss)  68   8 Settlements  (1,100)  (100)Balance at end of period $2,208  $3,240 Total amount of unrealized gains (losses) for the period included in other comprehensive loss attributable to the change in fair market value of related assets still held at the reporting date $-  $-   Liability – Contingent ConsiderationFair Value Measurements Using SignificantUnobservable Inputs(Level 3) Description 2013  2012 Balance at beginning of period $-  $- Fair value of contingent consideration – acquisition of Molecular Insight  15,900   - Fair value adjustment to contingent consideration included in net loss  (200)  - Balance at end of period $15,700  $- Changes in unrealized gains or losses for the period included in earnings (or changes in net assets) for liabilities held at the end of the reporting period $(200) $-                                                                                                                                                                                                                |
| Schedule of amortized cost basis, the aggregate fair value and gross unrealized holdings | The following tables summarize the amortized cost basis, the aggregate fair value and gross unrealized holding gains and losses at December 31, 2013 and 2012:  Amortized  Fair  Unrealized Holding 2013: Cost Basis  Value  Gains  (Losses)  Net Maturities greater than ten years:          Auction rate securities $2,400  $2,208  $-  $(192) $(192)  $2,400  $2,208  $-  $(192) $(192)  Amortized  Fair  Unrealized Holding 2012: Cost Basis  Value  Gains  (Losses)  Net Maturities greater than ten years:          Auction rate securities $2,500  $2,300  $-  $(200) $(200)Investments without stated maturity dates:                    Auction rate securities  1,000   940   -   (60)  (60)  $3,500  $3,240  $-  $(260) $(260)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of gross unrealized losses and fair value of our marketable securities          | The following table shows the gross unrealized losses and fair value of our auction rate securities with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2013 and 2012.2013: Less than 12 Months  12 Months or Greater  Total Description of Securities Fair Value  Unrealized Losses  Fair Value  Unrealized Losses  Fair Value  Unrealized Losses              Auction rate securities $-  $-  $2,208  $(192) $2,208  $(192)Total $-  $-  $2,208  $(192) $2,208  $(192)2012: Less than 12 Months  12 Months or Greater  Total Description of Securities Fair Value  Unrealized Losses  Fair Value  Unrealized Losses  Fair Value  Unrealized Losses              Auction rate securities $-  $-  $3,240  $(260) $3,240  $(260)Total $-  $-  $3,240  $(260) $3,240  $(260)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

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| - Definition
Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.
+ References
No definition available.
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| - Definition
Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258
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| - Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.
+ References
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| - Definition
Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.
+ References
No definition available.
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