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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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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, for which the customer has not been billed, classified as current.

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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