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Supplemental balance sheet and cash flow information (revenue in excess of billings) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Revenue in excess of billings    
Conditional right to receive consideration $ 23,364 $ 13,950
Unconditional right to receive consideration [1] 8,693 3,667
Revenue in excess of billings 32,057 17,617
Unbilled receivables $ 31,350 $ 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 $31,350 as of June 30, 2021 and $21,319 as of December 31, 2020.