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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

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