| **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, 2010                                                                                      | $ 43         | $ 453,353                  | $ (399,055)         | $ (292)                                       | $ (2,741)      | $ 51,308 |
| Balance, beginning (in shares) at Dec. 31, 2010                                                                          | 33,326       |                       |                |                                          | (200)          |     |
| Net (loss) income                                                                                                        | 0            | 0                          | 10,381              | 0                                             | 0              | 10,381   |
| Other comprehensive income                                                                                               | 0            | 0                          | 0                   | 24                                            | 0              | 24       |
| Compensation expenses for share-based payment arrangements                                                               | 0            | 6,362                      | 0                   | 0                                             | 0              | 6,362    |
| Forfeitures of restricted stock                                                                                          | 0            | 0                          | 0                   | 0                                             | 0              | 0        |
| Forfeitures of restricted stock (in shares)                                                                              | (38)         |                       |                |                                          | 0              |     |
| Sale of common stock under employee stock purchase plans and exercise of stock options                                   | 1            | 3,725                      | 0                   | 0                                             | 0              | 3,726    |
| Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)                       | 758          |                       |                |                                          | 0              |     |
| 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                                                                                                        | 0            | 0                          | (35,431)            | 0                                             | 0              | (35,431) |
| Other comprehensive income                                                                                               | 0            | 0                          | 0                   | 8                                             | 0              | 8        |
| Compensation expenses for share-based payment arrangements                                                               | 0            | 6,536                      | 0                   | 0                                             | 0              | 6,536    |
| Forfeitures of restricted stock                                                                                          | 0            | 0                          | 0                   | 0                                             | 0              | 0        |
| Forfeitures of restricted stock (in shares)                                                                              | (6)          |                       |                |                                          | 0              |     |
| Sale of common stock in public offering, net of underwriting discounts and commissions and offering expenses             | 17           | 23,331                     | 0                   | 0                                             | 0              | 23,348   |
| Sale of common stock in public offering, net of underwriting discounts and commissions and offering expenses (in shares) | 12,650       |                       |                |                                          | 0              |     |
| Sale of common stock under employee stock purchase plans and exercise of stock options                                   | 0            | 306                        | 0                   | 0                                             | 0              | 306      |
| Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)                       | 75           |                       |                |                                          | 0              |     |
| 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)          |     |
| Net (loss) income                                                                                                        | 0            | 0                          | (42,572)            | 0                                             | 0              | (42,572) |
| Other comprehensive income                                                                                               | 0            | 0                          | 0                   | 68                                            | 0              | 68       |
| Compensation expenses for share-based payment arrangements                                                               | 0            | 3,546                      | 0                   | 0                                             | 0              | 3,546    |
| Forfeitures of restricted stock                                                                                          | 0            | 0                          | 0                   | 0                                             | 0              | 0        |
| Forfeitures of restricted stock (in shares)                                                                              | (1)          |                       |                |                                          | 0              |     |
| Acquisition of subsidiary, net of issuance costs                                                                         | 6            | 11,214                     | 0                   | 0                                             | 0              | 11,220   |
| Stock Issued During Period, Shares, Acquisitions                                                                         | 4,472        |                       |                |                                          | 0              |     |
| Sale of common stock in public offering, net of underwriting discounts and commissions and offering expenses             | 12           | 40,066                     | 0                   | 0                                             | 0              | 40,078   |
| Sale of common stock in public offering, net of underwriting discounts and commissions and offering expenses (in shares) | 9,775        |                       |                |                                          | 0              |     |
| Sale of common stock under stock incentive plan and exercise of stock options                                            | 0            | 71                         | 0                   | 0                                             | 0              | 71       |
| Sale of common stock under stock incentive plan and exercise of stock options (in shares)                                | 14           |                       |                |                                          | 0              |     |
| Balance, ending at Dec. 31, 2013                                                                                         | $ 79         | $ 548,510                  | $ (466,677)         | $ (192)                                       | $ (2,741)      | $ 78,979 |
| Balance, ending (in shares) at Dec. 31, 2013                                                                             | 61,025       |                       |                |                                          | (200)          |     |

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Number of shares issued during the period as a result of an employee stock purchase plan.
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Aggregate change in value for stock issued during the period as a result of stock incentive plan.
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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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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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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 of stock issued during the period pursuant to acquisitions.
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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 related to Restricted Stock Award forfeited 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.
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| - Definition
Value of stock issued pursuant to acquisitions during the period.
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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.
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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.
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Value of stock related to Restricted Stock Awards forfeited during the period.
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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.
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