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Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Components of Deferred Tax Assets [Abstract]    
Net operating loss carryforwards $ 4,464 $ 1,028
Tax credit carryforwards 134 345
Stock-based compensation 2,223 2,550
Licensing deduction deferral 5,961 2,105
Other 56 395
Gross deferred tax assets 12,838 6,423
Valuation allowance (11,410) (4,658)
Net deferred tax asset $ 1,428 $ 1,765