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Taxes - Constituents of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Non-current deferred tax assets: |  |
Stock-based compensation expense | $ 15,365,000 | $ 13,895,000
Federal and state tax credit carryforwards | 5,154,000 | 5,091,000
Inventory and revenue related | 2,919,000 | 2,985,000
Depreciation | 2,882,000 | 2,328,000
Bonuses, commissions, and other compensation | 2,483,000 | 2,500,000
Other | 3,714,000 | 4,175,000
Gross non-current deferred tax assets | 32,517,000 | 30,974,000
Non-current deferred tax liabilities: |  |
Nondeductible intangible assets | (379,000) | (1,198,000)
Gross non-current deferred tax liabilities | (379,000) | (1,198,000)
Valuation allowance | (4,116,000) | (3,259,000)
Net non-current deferred tax assets | 28,022,000 | 26,517,000
Non-current deferred tax liabilities: |  |
Other | 0 | (319,000)
Net non-current deferred tax liabilities | $ 0 | $ (319,000)

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