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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets: Net operating loss carryforwards | $ 46,096 | $ 41,840
Deferred tax assets: Stock-based compensation | 2,918 | 2,907
Deferred tax assets: Inventory reserve |  | 2,340
Deferred tax assets: Federal R&D credit | 2,222 | 2,222
Deferred tax assets: Accrued expenses | 49 | 492
Deferred tax assets: Depreciation |  |
Deferred tax assets: Other | 98 | 108
Total deferred tax assets | 51,383 | 49,909
Deferred tax liabilities: Depreciation | (31) | (37)
Deferred tax liabilities: Intangibles | (134) | (210)
Total deferred tax liabilities | (165) | (247)
Less valuation allowance | (51,352) | (49,796)
Net deferred tax liability | $ (134) | $ (134)

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