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Income Taxes - Reconciliation of Effective Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Income tax at statutory rate $ (9,828) $ (3,988)
State income taxes, net of Federal benefit 16 (132)
Research and development tax credit (175) (145)
Change in Federal tax rate due to tax reform 0 3,221
Meals and entertainment 416 338
Promissory note - debt discount 105 0
Revaluation of contingent royalty obligation 2,205 0
Meals and entertainment 17 3
Valuation allowance 7,309 (6,548)
Total provision (benefit) for income taxes $ 65 $ (7,251)