Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Tax Reconciliation (Details)

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Income Taxes Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Federal statutory tax rate (percent) 21.00% 21.00% 34.00%
Expected income tax benefit $ (1,393) $ (697) $ (4,107)
State income taxes, net of federal tax effect (219) 455 (306)
Effect of deferred rate change 0 8 11,851
Foreign tax 27 38 (87)
Non-deductible stock issuance costs 3 85 186
Federal R&D credit (54) (32) (24)
Foreign unremitted earnings 0 130 (20)
Change in valuation allowance 1,379 408 (7,764)
Refundable AMT credits 0 (12) (172)
Other, net 63 (85) 85
Income tax expense (benefit) $ (194) $ 298 $ (358)