Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following table presents the Company’s revenue disaggregated by sales recorded over-time and sales recorded at a point in time (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Over-time revenue	$	169,753	$	112,329	$	591,117	$	620,447
Point in time revenue	22,315		27,133		49,679		71,649
Total revenue	$	192,068	$	139,462	$	640,796	$	692,096

Contract assets consisting of unbilled receivables are recorded within accounts receivable on the condensed consolidated balance sheets on a contract-by-contract basis at the end of the reporting period and consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Unbilled receivables	$	61,108	$	18,073

Contract liabilities consisting of deferred revenue recorded on a contract-by-contract basis at the end of each reporting period were as follows (in thousands):

	September 30, 2021		December 31, 2020
Deferred revenue	$	81,347	$	149,821