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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Research and development tax credit carryforwards $ 23,244 $ 20,019
Stock-based compensation 3,133 2,793
Inventory reserves 2,109 2,059
Investment tax credit carryforwards 1,976 2,181
Vacation accrual 1,218 1,255
Net operating loss carryforwards 1,091 4,918
UNICAP 275 3
International deferred tax assets 265 210
Unrealized loss on investments 132 135
Sales allowances 128 25
Contingent consideration liabilities 88 148
Deferred revenue 66 79
Bad debt reserves 52 36
Warranty reserves 35 45
Other 233 35
Total deferred tax assets 34,045 33,941
Less: Valuation allowance for deferred tax assets (30,031) (33,024)
Net deferred tax assets 4,014 917
Deferred tax liabilities:    
Depreciation (3,144) (76)
Prepaid expenses (473) (470)
Patent amortization (107) (161)
Other (25)  
Total deferred tax liabilities (3,749) (707)
Net deferred tax assets (liabilities) $ 265 $ 210