Annual report pursuant to Section 13 and 15(d) 12-31-2018

Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details)

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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
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)