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Income Taxes - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:      
Net operating loss carryforwards $ 38,895 $ 39,236  
Stock-based compensation 3,096 2,427  
Depreciation and amortization 0 245  
Non-deductible accrued expenses and reserves 2,916 683  
Research and development credits 6,724 4,629  
Gross deferred tax assets 51,631 47,220  
Deferred tax liabilities:      
Acquired intangible assets (1,298) (1,856)  
Depreciation and amortization (894) 0  
Net deferred tax assets prior to valuation allowance 49,439 45,364  
Valuation allowance (49,439) (45,364) $ (64,300)
Net deferred tax assets $ 0 $ 0