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Segments and Geographical Information - Non-Cash Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | $ 48,377 | $ 49,039 | $ 141,582 | $ 134,855
Depreciation and amortization | 55,717 | 37,793 | 135,441 | 106,905
Operating Segments | Clear Aligner |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 6,069 | 7,648 | 17,952 | 20,031
Depreciation and amortization | 32,976 | 17,971 | 71,375 | 49,027
Operating Segments | Systems and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 419 | 427 | 1,225 | 1,207
Depreciation and amortization | 11,160 | 8,099 | 28,931 | 23,007
Unallocated corporate expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 41,889 | 40,964 | 122,405 | 113,617
Depreciation and amortization | $ 11,581 | $ 11,723 | $ 35,135 | $ 34,871

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