Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Loss Before Provision for Income Taxes (Details)

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Income Taxes - Components of Loss Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
United States $ (11,751) $ (10,653) $ (22,994)
Foreign (167) (262) 79
Loss before income taxes $ (11,918) $ (10,915) $ (22,915)