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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Federal and state loss carryforwards $ 681 $ 49,533
Reserves, accruals and other 230 391
Depreciation and amortization 1,901 1,100
Deferred stock-based compensation 2,571 2,483
Research and development credit carryforwards 6,537 15,487
Foreign tax and other credits 242 513
Total deferred tax assets 12,162 69,507
Deferred tax liabilities:    
Acquired intangible assets and other   408
Less: Valuation allowance (11,920) (68,857)
Net deferred tax assets $ 242 $ 242