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Segments and Geographical Information - Non-Cash Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | $ 48,208 | $ 47,028 | $ 93,205 | $ 85,816
Depreciation and amortization | 40,576 | 36,166 | 79,724 | 69,112
Operating Segments | Clear Aligner |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 6,065 | 8,619 | 11,883 | 12,383
Depreciation and amortization | 19,495 | 16,623 | 38,399 | 31,056
Operating Segments | Systems and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 403 | 421 | 806 | 780
Depreciation and amortization | 9,302 | 8,070 | 17,771 | 14,908
Unallocated corporate expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 41,740 | 37,988 | 80,516 | 72,653
Depreciation and amortization | $ 11,779 | $ 11,473 | $ 23,554 | $ 23,148

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