Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Trade and Other Receivables, Prepayments and Contract Assets - Changes in Contract Assets (Details)

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Trade and Other Receivables, Prepayments and Contract Assets - Changes in Contract Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Contract Assets [Roll Forward]    
Contract assets at beginning of period $ 2,378 $ 1,541
Revenues recognized but not billed 3,444 1,511
Amounts reclassified to trade receivable (1,338) (674)
Contract assets at end of period $ 4,484 $ 2,378