| (Unaudited) | ||||||||||||||||
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Three Months Ended
September 30, |
Nine Months Ended
September 30, | |||||||||||||||
| (in thousands) | 2024 | 2023 | 2024 | 2023 | ||||||||||||
| Total operating expense | $ | 125,747 | $ | 116,181 | $ | 375,013 | $ | 370,927 | ||||||||
| Stock-based compensation expense | (15,225 | ) | (18,058 | ) | (44,480 | ) | (58,631 | ) | ||||||||
| Amortization | (9,246 | ) | (7,704 | ) | (24,313 | ) | (23,143 | ) | ||||||||
| Loss on mark-to-market adjustment of
contingent consideration | — | 3,493 | (189 | ) | (4,494 | ) | ||||||||||
| Non-GAAP operating expense | $ | 101,276 | $ | 93,912 | $ | 306,031 | $ | 284,659 | ||||||||
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Altair Announces Third Quarter 2024 Financial Results
The following table provides a reconciliation of Non-GAAP operating expense to Total operating expense, the most comparable GAAP financial measure:
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