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Supplemental balance sheet and cash flow information (revenue in excess of billings) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenue in excess of billings    
Conditional right to receive consideration $ 28,157 $ 13,950
Unconditional right to receive consideration [1] 13,032 3,667
Revenue in excess of billings 41,189 17,617
Unbilled receivables $ 29,993 $ 21,319
[1] Represents revenues that are earned but not currently billable under the related contract terms. Trade accounts receivable on the consolidated balance sheets included unbilled receivables of $29,993 as of September 30, 2021 and $21,319 as of December 31, 2020.