Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Net Income Taxes (Details)

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Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Net Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income tax at statutory rate $ (575) $ (3,339) $ (2,331)
Change in valuation allowance 1,595 (8,354) 2,146
Change in tax rate   9,788  
Change in deferreds 7 (39)  
State tax (309) 536 9
Mark-to-market on warrants   1,267 178
Stock-based compensation (615) 84 24
Research and development credit (220) (62) (88)
Foreign rate differential (86) 56 40
Subpart F - transition tax 81 68  
Lobbying 78 79  
Other 31 76 $ 22
Total tax expense $ (13) $ 160