Quarterly report pursuant to Section 13 or 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
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]    
Net Receivables, Opening balance $ 17,618 $ 16,944
Net Receivables, Closing balance 18,182 14,049
Increase/(decrease) 564 (2,895)
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 9
Increase/(decrease) $ (3) $ (6)