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Contract Assets and Liabilities - Summary of Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Contractors [Line Items]
Deferred revenue	$ 155,570	$ 102,673
Accrued loss provision	2,826	2,813
Contract liabilities	158,396	105,486
Changes in contract liabilities	52,918	$ 28,163	$ 22,551
Net Period Change
Contractors [Line Items]
Change in deferred revenue	52,897
Change in accrued loss provision	13
Changes in contract liabilities	$ 52,910

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Its represent the contract with customer, liability excluding provision for loss on contracts, current.

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- Definition

The increase (decrease) during the reporting period of the amount of accrued loss provision.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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- Definition

Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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