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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2020
Revenue. |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
​ | ​ | (in thousands)
Systems | ​ | $ | 76,815 | ​ | $ | 37,224 | ​ | $ | 159,152 | ​ | $ | 94,316
Aftermarket | ​ | ​ | 46,150 | ​ | ​ | 37,081 | ​ | ​ | 82,804 | ​ | ​ | 71,466
​ | ​ | $ | 122,965 | ​ | $ | 74,305 | ​ | $ | 241,956 | ​ | $ | 165,782
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
​ | ​ | (in thousands)
North America | ​ | $ | 8,915 | ​ | $ | 9,380 | ​ | $ | 19,576 | ​ | $ | 20,988
Asia Pacific | ​ | ​ | 106,604 | ​ | ​ | 49,717 | ​ | ​ | 203,432 | ​ | ​ | 112,643
Europe | ​ | ​ | 7,446 | ​ | ​ | 15,208 | ​ | ​ | 18,948 | ​ | ​ | 32,151
​ | ​ | $ | 122,965 | ​ | $ | 74,305 | ​ | $ | 241,956 | ​ | $ | 165,782
Schedule of Contract liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ | ​ | 2020 | ​ | 2019
​ | ​ | (in thousands)
Contract liabilities | ​ | $ | 30,417 | ​ | $ | 29,251
​ | ​ | ​ | ​ | ​ | ​ | ​
​ 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 | ​ | Six months ended
​ | ​ | June 30, |  | June 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
​ | ​ | (in thousands)
Balance, beginning of the period | ​ | $ | 34,106 | ​ | $ | 20,481 | ​ | $ | 29,251 | ​ | $ | 22,584
Deferral of revenue | ​ | ​ | 6,248 | ​ | ​ | 3,943 | ​ | ​ | 10,724 | ​ | ​ | 6,225
Recognition of deferred revenue | ​ | ​ | (9,937) | ​ | ​ | (10,344) | ​ | ​ | (9,558) | ​ | ​ | (14,729)
Balance, ending of the period | ​ | $ | 30,417 | ​ | $ | 14,080 | ​ | $ | 30,417 | ​ | $ | 14,080

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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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- 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 + Details
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