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Taxes - Constituents of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current deferred tax assets:    
Inventory and revenue related $ 2,985 $ 4,911
Bonuses, commissions, and other compensation 2,500 2,280
Other 1,619 1,794
Net current deferred tax assets 7,104 8,985
Non-current deferred tax assets:    
Stock-based compensation expense 13,895 10,290
Federal and state tax credit carryforwards 5,091 4,547
Depreciation 2,328 1,945
Other 2,556 2,583
Gross non-current deferred tax assets 23,870 19,365
Non-current deferred tax liabilities:    
Nondeductible intangible assets (1,198) (2,430)
Gross non-current deferred tax liabilities (1,198) (2,430)
Valuation allowance (3,259) (2,483)
Net non-current deferred tax assets 19,413 14,452
Current deferred tax liabilities:    
Other (319) 0
Net current deferred tax liabilities $ (319) $ 0