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Revenue - Contract balances (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Contract balances |  |
Revenue recognized that was included in the balance sheet | $ 11,600 |
Receivables, inclusive of trade and unbilled | 45,762 | $ 57,537
Contract Assets (current and non-current) | 6,877 | 9,079
Contract Liabilities (Deferred Revenue current and non-current) | $ 53,734 | $ 55,147
Revenue, Practical Expedient, Financing Component [true/false] | true |
Minimum |  |
Contract balances |  |
The amount of time contract assets are transferred to receivables | 3 years |
Maximum |  |
Contract balances |  |
The amount of time contract assets are transferred to receivables | 5 years |

X
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- Definition Amount, before 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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