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Income Taxes - Reconciliation of Effective Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Income tax at statutory rate | $ (22,063) | $ (9,828)
State income taxes, net of Federal benefit | (3,905) | (3,148)
California NOL write-off | 5,174 | 0
Revaluation of contingent royalty obligation | 1,040 | 2,938
Meals and entertainment | 1,002 | 17
Change in state tax rate | (1,371) | 0
Stock compensation | 521 | 474
Research and development tax credit | (294) | (294)
Promissory note - debt discount | 128 | 105
Other, net | 50 | 0
Valuation allowance | 4,691 | 9,801
Total (benefit) provision for income taxes | $ (15,027) | $ 65

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