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Income Taxes - Components of the Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Taxes    
Operating loss carryforwards $ 81,403 $ 70,509
Tax credit carryforwards 23,072 18,514
Lease liabilities 308  
Other 7,994 8,627
Deferred Tax Assets, Gross 112,777 97,650
Right-of-use asset (306)  
Valuation allowance $ (112,471) $ (97,650)