| **CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)In Thousands**                                                                  | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Total     |
|------------------------------------------------------------------------------------------------------------------------------------------|--------------|----------------------------|---------------------|-----------------------------------------------|----------------|-----------|
| Balance, beginning at Dec. 31, 2009                                                                                                      | $ 42         | $ 439,943                  | $ (329,330)         | $ (307)                                       | $ (2,741)      | $ 107,607 |
| Balance, beginning (in shares) at Dec. 31, 2009                                                                                          | 32,142       |                       |                |                                          | (200)          |      |
| Net (loss) income                                                                                                                        |         |                       | (69,725)            |                                          |           | (69,725)  |
| Other comprehensive income                                                                                                               |         |                       |                | 15                                            |           | 15        |
| Compensation expenses for share-based payment arrangements                                                                               |         | 9,515                      |                |                                          |           | 9,515     |
| Issuance of restricted stock, net of forfeitures (in shares)                                                                             | 173          |                       |                |                                          |           |      |
| Sale of common stock under employee stock purchase plans and exercise of stock options                                                   | 1            | 3,895                      |                |                                          |           | 3,896     |
| Sale of common stock under stock incentive plan and exercise of stock options (in shares)                                                | 1,011        |                       |                |                                          |           |      |
| Balance, ending at Dec. 31, 2010                                                                                                         | 43           | 453,353                    | (399,055)           | (292)                                         | (2,741)        | 51,308    |
| Balance, ending (in shares) at Dec. 31, 2010                                                                                             | 33,326       |                       |                |                                          | (200)          |      |
| Net (loss) income                                                                                                                        |         |                       | 10,381              |                                          |           | 10,381    |
| Other comprehensive income                                                                                                               |         |                       |                | 24                                            |           | 24        |
| Compensation expenses for share-based payment arrangements                                                                               |         | 6,362                      |                |                                          |           | 6,362     |
| Issuance of restricted stock, net of forfeitures (in shares)                                                                             | (38)         |                       |                |                                          |           |      |
| Sale of common stock under employee stock purchase plans and exercise of stock options                                                   | 1            | 3,725                      |                |                                          |           | 3,726     |
| Sale of common stock under stock incentive plan and exercise of stock options (in shares)                                                | 758          |                       |                |                                          |           |      |
| Balance, ending at Dec. 31, 2011                                                                                                         | 44           | 463,440                    | (388,674)           | (268)                                         | (2,741)        | 71,801    |
| Balance, ending (in shares) at Dec. 31, 2011                                                                                             | 34,046       |                       |                |                                          | (200)          |      |
| Net (loss) income                                                                                                                        |         |                       | (35,431)            |                                          |           | (35,431)  |
| Other comprehensive income                                                                                                               |         |                       |                | 8                                             |           | 8         |
| Compensation expenses for share-based payment arrangements                                                                               |         | 6,536                      |                |                                          |           | 6,536     |
| Issuance of restricted stock, net of forfeitures (in shares)                                                                             | (6)          |                       |                |                                          |           |      |
| Sale of common stock under stock incentive plan and exercise of stock options                                                            |         | 306                        |                |                                          |           | 306       |
| Sale of common stock under stock incentive plan and exercise of stock options (in shares)                                                | 75           |                       |                |                                          |           |      |
| Sale of common stock in public offering, net of underwriting discounts and commissions ($1,518) and offering expenses ($434) (in shares) | 12,650       |                       |                |                                          |           |      |
| Sale of common stock in public offering, net of underwriting discounts and commissions ($1,518) and offering expenses ($434)             | 17           | 23,331                     |                |                                          |           | 23,348    |
| Balance, ending at Dec. 31, 2012                                                                                                         | $ 61         | $ 493,613                  | $ (424,105)         | $ (260)                                       | $ (2,741)      | $ 66,568  |
| Balance, ending (in shares) at Dec. 31, 2012                                                                                             | 46,765       |                       |                |                                          | (200)          |      |

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| - Definition
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.
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| - Definition
Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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Number of shares issued during the period as a result of an employee stock purchase plan.
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| - Definition
Number of new stock issued during the period.
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| - Definition
Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.
+ References
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| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
+ References
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