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Income Taxes - Loss Before Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ (19,925) $ (4,153) $ (16,271)
Foreign 33 8 37
Total loss before income taxes $ (19,892) $ (4,145) $ (16,234)