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Income Taxes - Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Allowance for doubtful accounts $ 0 $ 0 $ 18
Accrued expenses and other reserves 1,964 1,749 3,138
Tax credits, deferred R&D, and other 65 197 142
Net operating loss 10,793 8,610 9,239
Valuation allowance (12,822) (10,556) (12,537)
Net deferred tax assets $ 0 $ 0 $ 0