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Income Taxes - Significant Components of Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating losses $ 88,626 $ 67,653
Tax credits 22,339 16,308
Accruals 1,521 1,285
Share-based compensation 9,322 7,444
Gross deferred tax assets 121,808 92,690
Valuation allowance (111,429) (83,972)
Net deferred tax assets 10,379 8,718
Deferred Tax Liabilities, Fixed Assets (677) (605)
Net deferred tax assets $ 9,702 $ 8,113