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Income Taxes - Income Taxes Effect of Each Type of Temporary Difference Comprising Net Differed Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Net operating losses $ 118,220 $ 119,355  
Stock-based compensation 7,111 8,113  
Tax credits 9,149 7,816  
Lease Liability 2,715    
Other reserves and accrued liabilities 5,580 6,344  
Gross deferred tax assets 142,775 141,628  
Less: valuation allowance (137,976) (140,117) $ (131,389)
Total deferred tax assets 4,799 1,511  
Deferred tax liabilities:      
Depreciation and amortization (2,544) (1,011)  
Lease Asset (2,242)    
Other liabilities (13) (500)  
Total deferred tax liabilities $ (4,799) $ (1,511)