Annual report pursuant to Section 13 and 15(d)

Income taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details)

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Income taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current:    
US Federal
US State
Foreign
Total current benefit
Deferred:    
US Federal 117 495
US State 26 112
Foreign 92
Total deferred benefit 143 699
Total benefit for income taxes $ 143 $ 699