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Revenue (Tables) | 3 Months Ended
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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 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 + Details
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