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Supplemental balance sheet and cash flow information (revenue in excess of billings) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Revenue in excess of billings |  |  |
Conditional right to receive consideration |  | $ 20,072 | $ 13,950
Unconditional right to receive consideration | [1] | 7,583 | 3,667
Revenue in excess of billings |  | 27,655 | 17,617
Unbilled receivables |  | $ 19,295 | $ 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 $19,295 as of March 31, 2021 and $21,319 as of December 31, 2020.

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