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Cash and Cash Equivalents - Adjustments for non-cash items (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Adjustments to reconcile profit (loss) [abstract]      
Income taxes $ (1,557) $ (825) $ (735)
Tax credit schemes accounted for as grants (510)    
Depreciation and amortization 105 81 74
Interest income   (9) (2)
Interest expense 30 39 15
Share-based compensation expenses 3,408 2,362 2,069
Change in fair value of convertible debt instruments   1,183 684
Other adjustments, primarily exchange rate adjustments 107 114 18
Total adjustments for non-cash items $ 1,583 $ 2,945 $ 2,123