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Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforwards $ 71,925 $ 65,957
Tax credit carryforwards 4,947 4,533
Accruals 1,274 1,125
Other 1,088 698
Gross deferred tax assets 79,234 72,313
Valuation allowance (76,295) (70,053)
Total deferred tax assets 2,939 2,260
Deferred tax liabilities:    
Property and equipment 195 95
Purchased intangibles (8,979) (2,355)
Other (212) 0
Total deferred tax liabilities (8,996) $ (2,260)
Net deferred tax liabilities $ (6,057)