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Income Taxes - Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Accrued liabilities $ 0 $ 4,070
Amortization of intangible assets 1,904 2,169
Capitalized inventory costs 2,945 3,156
Depreciation 2,530 426
Income tax credits 15,558 11,800
Inventory reserves 3,383 2,887
Net operating losses 2,844 2,644
Operating lease obligations 4,639 7,878
Stock-based compensation 4,600 4,018
Other 409 71
Total deferred tax assets 38,812 39,119
Deferred tax liabilities:    
Accrued liabilities (1,939) 0
Allowance for credit losses (710) (270)
Right of use assets (4,577) (7,480)
Other (29) (3,866)
Total deferred tax liabilities (7,255) (11,616)
Net deferred tax assets before valuation allowance 31,557 27,503
Less: Valuation allowance (27,906) (24,797)
Net deferred tax assets $ 3,651 $ 2,706