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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Deferred tax assets (liabilities): |  |
Deferred revenue | $ 6,345,000 | $ 5,857,000
Stock compensation | 4,460,000 | 6,451,000
Inventory related items | 2,441,000 | 2,915,000
Tax credit carry forwards | 9,349,000 | 4,871,000
Reserves and accruals | 3,960,000 | 4,675,000
Loss carry forwards | 8,643,000 | 8,077,000
Other, net | 1,307,000 | 847,000
Total net deferred tax assets | 36,505,000 | 33,693,000
Intangibles | (36,780,000) | (57,427,000)
Depreciation and amortization | (14,338,000) | (20,071,000)
Prepaid expenses | (4,512,000) | (3,746,000)
Total deferred tax liabilities | (55,630,000) | (81,244,000)
Net deferred tax liabilities | (19,125,000) | $ (47,551,000)
Valuation allowance | $ 0 |

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