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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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