Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Contract Balances (Details)

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Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Net Receivables, Opening balance $ 17,618 $ 16,944
Net Receivables, Closing balance 18,158 17,618
Increase/(decrease) 540 674
Contract Liabilities, Current, Opening balance 14 14
Contract Liabilities, Current, Closing balance 14 14
Increase/(decrease) 0 0
Contract Liabilities, Long-Term, Opening balance 3 15
Contract Liabilities, Long-Term, Closing balance 0 3
Increase/(decrease) $ (3) $ (12)