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Revenue (Tables) | 3 Months Ended
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Mar. 31, 2025
Revenue |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​
​ | ​ | March 31, | ​
​ | ​ | 2025 | ​ | 2024 | ​
​ | ​ | (in thousands) | ​
Systems | ​ | $ | 137,609 | ​ | $ | 195,432 | ​
Aftermarket | ​ | ​ | 54,954 | ​ | ​ | 56,940 | ​
Total Revenue | ​ | $ | 192,563 | ​ | $ | 252,372 | ​
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​
​ | ​ | March 31, | ​
​ | ​ | 2025 | ​ | 2024 | ​
​ | ​ | (in thousands) | ​
North America | ​ | $ | 40,525 | ​ | $ | 45,503 | ​
Asia Pacific | ​ | ​ | 134,426 | ​ | ​ | 188,217 | ​
Europe | ​ | ​ | 17,612 | ​ | ​ | 18,652 | ​
Total Revenue | ​ | $ | 192,563 | ​ | $ | 252,372 | ​
Schedule of Contract liabilities |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ | ​ | 2025 | ​ | 2024
​ | ​ | (in thousands)
Contract liabilities | ​ | $ | 139,324 | ​ | $ | 138,174
​ | ​ | ​ | ​ | ​ | ​ | ​
Contract liabilities are reflected as deferred revenue on the consolidated balance sheets and include payments received in advance of system sales as well as deferral of revenue from systems sales for installation and other future performance obligations. Contract liabilities are recognized as revenue upon the fulfillment of performance obligations. ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​
​ | ​ | March 31, |
​ | ​ | 2025 | ​ | 2024 | ​
​ | ​ | (in thousands) | ​
Balance, beginning of the period | ​ | $ | 138,174 | ​ | $ | 210,885 | ​
Deferral of revenue* | ​ | ​ | 26,359 | ​ | ​ | 42,974 | ​
Recognition of deferred revenue | ​ | ​ | (25,209) | ​ | ​ | (45,441) | ​
Balance, end of the period | ​ | $ | 139,324 | ​ | $ | 208,418 | ​
​ * Amount includes a reclassification of $8.0 million of a refund liability included within other current liabilities as of December 31, 2024 to deferred revenue for the three months ended March 31, 2025.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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