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Income Taxes - Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Inventory reserves $ 1,428 $ 1,104
Capitalized research costs 22 23
Capitalized inventory costs 1,541 609
Net operating losses 2,810 999
Acquired tangible assets 1,204 287
Accrued liabilities 1,090 1,239
Income tax credits 10,020 8,861
Stock-based compensation 3,181 2,712
Amortization of intangible assets 1,135 526
Total deferred tax assets 22,431 16,360
Deferred tax liabilities:    
Depreciation 661 (944)
Allowance for doubtful accounts (739) (444)
Other (4,189) (2,680)
Total deferred tax liabilities (4,267) (4,068)
Net deferred tax assets before valuation allowance 18,164 12,292
Less: Valuation allowance (17,261) (8,802)
Net deferred tax assets $ 903 $ 3,490