| (Unaudited) | ||||||||||||||||
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Three Months Ended
September 30, |
Nine Months Ended
September 30, | |||||||||||||||
| (in thousands) | 2022 | 2021 | 2022 | 2021 | ||||||||||||
| Total operating expense | $ | 116,438 | $ | 91,732 | $ | 334,306 | $ | 286,821 | ||||||||
| Stock-based compensation expense | (20,378 | ) | (9,522 | ) | (56,259 | ) | (27,438 | ) | ||||||||
| Amortization | (6,571 | ) | (4,432 | ) | (18,682 | ) | (13,924 | ) | ||||||||
| Gain on mark-to-market adjustment of contingent consideration | 2,178 | — | 7,482 | — | ||||||||||||
| Restructuring expense | — | 114 | — | (4,028 | ) | |||||||||||
| Non-GAAP operating expense | $ | 91,667 | $ | 77,892 | $ | 266,847 | $ | 241,431 | ||||||||
Altair Announces Third Quarter 2022 Financial Results
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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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