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Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue.

Schedule of revenue by discipline

​

​	​	​	​	​	​	​
​	​	Three months ended
​	​	March 31,
​	​	2021		​	2020
​	​	(in thousands)
Systems	​	$	80,991	​	$	82,338
Aftermarket	​	​	51,785	​	​	36,653
Total Revenue	​	$	132,776	​	$	118,991

Schedule of revenue by geographic markets

​

​	​	​	​	​	​	​	​
​	​	Three months ended
​	​	March 31,
​	​	2021		​	2020		​
​	​	(in thousands)
North America	​	$	9,508	​	$	10,661	​
Asia Pacific	​	​	103,391	​	​	96,828	​
Europe	​	​	19,877	​	​	11,502	​
Total Revenue	​	$	132,776	​	$	118,991	​

Schedule of Contract liabilities

​

​	​	​	​	​	​	​
​	​	March 31,		​	December 31,
​	​	2021		​	2020
​	​	(in thousands)
Contract liabilities	​	$	22,142	​	$	23,058
​	​	​	​	​	​	​

​

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,
​	​	2021		​	2020
​	​	(in thousands)
Balance, beginning of the period	​	$	23,058	​	$	29,251
Deferral of revenue	​	​	11,264	​	​	9,799
Recognition of deferred revenue	​	​	(12,180)	​	​	(4,944)
Balance, end of the period	​	$	22,142	​	$	34,106

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- Definition

Tabular disclosure of revenue from external customers by discipline areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue.

+ References

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- Definition

Tabular disclosure of contract balances and changes in contract balances.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045

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- Definition

Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599

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