Annual report pursuant to Section 13 and 15(d)

Income taxes (Reconciliation of Income Taxes) (Details)

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Income taxes (Reconciliation of Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Statutory federal income tax expense (benefit) $ (2,660) $ (4,293)
State taxes, net of federal tax expense (benefit) (471) (664)
Stock compensation (45) 1,142
Tax return to provision true-up (8,737)
State tax rate change 2,231
Other 195
Change in valuation allowance 9,682 3,477
Income taxes benefit $ (143)