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Stock-Based Compensation - Restricted Stock Units Activity Under Company's Stock Plans (Details) - Restricted stock units - 2021 Equity Incentive Plan
 3 Months Ended
Mar. 31, 2025
$ / shares
shares
Number of Unvested Shares  
Beginning balance (in shares) | shares 11,251,503
Granted (in shares) | shares 4,127,500
Dividend equivalent grants (in shares) | shares 194,658
Vested (in shares) | shares (1,059,881)
Forfeited / cancelled (in shares) | shares (142,507)
Ending balance (in shares) | shares 14,371,273
Weighted- Average Grant Date Fair Value (per share)  
Beginning balance (in dollars per share) | $ / shares $ 9.86
Granted (in dollars per share) | $ / shares 5.24
Dividend equivalent grants (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares 10.82
Forfeited / cancelled (in dollars per share) | $ / shares 11.89
Ending balance (in dollars per share) | $ / shares $ 8.45