STOCK-BASED COMPENSATION - Summary of RSU Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Shares (in thousands)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	6,107,000
Restricted stock units
Shares (in thousands)
Unvested — Beginning balance (in shares)	5,956,000
Granted (in shares)	3,145,000
Vested (in shares)	(2,021,000)
Forfeited (in shares)	(920,000)
Unvested — Ending balance (in shares)	6,160,000
Weighted-Average Grant Date Fair Value
Unvested — Beginning balance (in usd per share) | $ / shares	$ 25.43
Granted (in usd per share) | $ / shares	6.57
Vested (in usd per share) | $ / shares	22.85
Forfeited (in usd per share) | $ / shares	33.98
Unvested — Ending balance (in usd per share) | $ / shares	$ 32.41
Unvested, weighted-average remaining contractual term	2 years 2 months 8 days
Unvested, unamortized compensation costs | $	$ 77,547