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Taxes - Constituents of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Non-current deferred tax assets:    
Stock-based compensation expense $ 11,664 $ 15,365
Federal and state tax credit carryforwards 6,707 5,154
Inventory and revenue related 3,415 2,919
Depreciation 2,279 2,882
Bonuses, commissions, and other compensation 5,704 2,483
Other 3,012 3,714
Gross non-current deferred tax assets 32,781 32,517
Non-current deferred tax liabilities:    
Nondeductible intangible assets (87) (379)
Gross non-current deferred tax liabilities (87) (379)
Valuation allowance (5,309) (4,116)
Net non-current deferred tax assets 27,385 28,022
Non-current deferred tax liabilities:    
Other (312) 0
Net non-current deferred tax liabilities $ (312) $ 0