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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Net operating losses $ 29,782 $ 21,657
Promissory note - debt discount 108 0
Accrued compensation 648 0
Stock compensation 1,552 292
Research and development credit carryforwards 2,436 2,109
Deferred rent 7 11
Intangible asset 3 3
Valuation allowance (34,536) (24,072)
Total deferred income tax assets 0 0
Deferred income tax liabilities:    
Intangible amortization (15,055) (14,990)
Total deferred income tax liabilities (15,055) (14,990)
Net deferred income taxes $ (15,055) $ (14,990)