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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Contractors [Line Items]
Deferred revenue	$ 102,673	$ 57,051
Accrued loss provision	2,813	1,483
Contract liabilities	105,486	58,534
Changes in contract liabilities	28,163	$ 22,551	$ (14,317)
Net Period Change [Member]
Contractors [Line Items]
Changes in deferred revenue	45,622
Changes in accrued loss provision	1,330
Changes in contract liabilities	$ 46,952

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- Definition

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

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No definition available.

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- Definition

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

+ References

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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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+ References

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-Publisher FASB
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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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