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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amounts computed at statutory federal rate |  |  |  |  |  |  |  |  | $ (3,131) | $ 1,317 | $ 1,204
State taxes net of federal benefit |  |  |  |  |  |  |  |  | (293) | 196 | (2)
Meals & entertainment |  |  |  |  |  |  |  |  | (10) | (8) | (9)
Acquisition related transaction costs |  |  |  |  |  |  |  |  | 0 | 0 | (37)
Imputed interest |  |  |  |  |  |  |  |  | (285) | (259) | (255)
CVRs |  |  |  |  |  |  |  |  | (2,027) | 695 | (601)
Stock-based compensation |  |  |  |  |  |  |  |  | 556 | 581 | (597)
Expired NOLs |  |  |  |  |  |  |  |  | 0 | (6,847) | (678)
Expired research and development credits |  |  |  |  |  |  |  |  | 641 | (1,984) | (1,200)
R&D credit study |  |  |  |  |  |  |  |  | 3,940 | 0 | 0
Change in uncertain tax positions |  |  |  |  |  |  |  |  | (364) | 830 | 0
Rate change for changes in state law |  |  |  |  |  |  |  |  | (901) | (3,388) | 0
Increase in deferred tax assets from completion of 382 analysis |  |  |  |  |  |  |  |  | (786) | 53,257 | 0
Change in valuation allowance |  |  |  |  |  |  |  |  | 3,509 | (41,768) | 15,486
Other |  |  |  |  |  |  |  |  | (1,223) | (1,431) | (41)
Income tax expense from continuing operations | $ (138) | $ (60) | $ (110) | $ (66) | $ 1,636 | $ (142) | $ (338) | $ 35 | $ (374) | $ 1,191 | $ 13,270

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