Revenue (Tables)

3 Months Ended

Mar. 31, 2022

Revenue.

Schedule of revenue by discipline

	Three months ended
	March 31,
	2022		2021
	(in thousands)
Systems	$	151,801	$	80,991
Aftermarket		51,794		51,785
Total Revenue	$	203,595	$	132,776

Schedule of revenue by geographic markets

	Three months ended
	March 31,
	2022		2021
	(in thousands)
North America	$	24,913	$	9,508
Asia Pacific		149,240		103,391
Europe		29,442		19,877
Total Revenue	$	203,595	$	132,776

Schedule of Contract liabilities

	March 31,		December 31,
	2022		2021
	(in thousands)
Contract liabilities	$	74,840	$	68,436

Contract liabilities are reflected as deferred revenue on the consolidated balance sheet and relate to payments invoiced or received in advance of completion of performance obligations under a contract. Contract liabilities are recognized as revenue upon the fulfillment of performance obligations.

	Three months ended
	March 31,
	2022		2021
	(in thousands)
Balance, beginning of the period	$	68,436	$	23,058
Deferral of revenue		23,394		11,264
Recognition of deferred revenue		(16,990)		(12,180)
Balance, end of the period	$	74,840	$	22,142