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Revenue (Tables)
12 Months Ended
Dec. 31, 2021
Revenue.  
Schedule of revenue by discipline

Year ended

December 31,

2021

2020

2019

(in thousands)

Systems

$

454,598

$

293,624

$

202,571

Aftermarket

207,830

180,936

140,387

Total Revenue

$

662,428

$

474,560

$

342,958

Schedule of revenue by geographic markets

Year ended

December 31,

2021

2020

2019

(in thousands)

North America

$

48,715

$

50,786

$

36,206

Asia Pacific

516,105

385,233

251,020

Europe

97,608

38,541

55,732

Total Revenue

$

662,428

$

474,560

$

342,958

Schedule of Contract liabilities

Year ended

   

December 31,

2021

2020

2019

(in thousands)

Balance, beginning of the period

$

23,058

$

29,251

$

22,584

Deferral of revenue

66,349

17,862

24,403

Recognition of deferred revenue

(20,971)

(24,055)

(17,736)

Balance, end of the period

$

68,436

$

23,058

$

29,251