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Income Taxes - Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Inventory reserves $ 1,228 $ 904
Capitalized research costs 52 79
Capitalized inventory costs 926 684
Net operating losses 582 1,151
Acquired intangible assets 148 143
Accrued liabilities 5,194 4,168
Income tax credits 11,251 8,568
Stock-based compensation 2,064 1,749
Total deferred tax assets 21,445 17,446
Deferred tax liabilities:    
Depreciation (2,639) (4,402)
Allowance for doubtful accounts (223) (180)
Amortization of intangible assets (1,274) (2,154)
Other (2,752) (2,256)
Total deferred tax liabilities (6,888) (8,992)
Net deferred tax assets before valuation allowance 14,557 8,454
Less: Valuation allowance (6,678) (5,716)
Net deferred tax assets $ 7,879 $ 2,738