SHARE-BASED COMPENSATION - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Number of Options
Ending balance (in shares)	8,261,261
Options to purchase common stock
Number of Options
Beginning balance (in shares)	5,722,449
Granted (in shares)	4,600,250
Exercised (in shares)	(942,587)
Forfeited or expired (in shares)	(1,118,851)
Ending balance (in shares)	8,261,261	5,722,449
Vested or expected to vest (in shares)	8,261,261
Exercisable (in shares)	2,490,556
Vested (in shares)	2,490,556
Weighted-Average Exercise Price
Beginning balance (in dollars per share)	$ 17.23
Granted (in dollars per share)	31.07
Exercised (in dollars per share)	10.38
Forfeited or expired (in dollars per share)	21.40
Ending balance (in dollars per share)	25.15	$ 17.23
Vested and expected to vest (in dollars per share)	25.15
Exercisable (in dollars per share)	20.09
Vested (in dollars per share)	$ 20.09
Weighted average remaining contractual term and Aggregate intrinsic value
Outstanding (Weighted Average Remaining Contractual Term)	8 years 3 months 21 days	8 years 7 months 20 days
Vested or expected to vest (Weighted Average Remaining Contractual Term)	8 years 3 months 21 days
Exercisable (Weighted Average Remaining Contractual Term)	6 years 4 months 28 days
Vested (Weighted Average Remaining Contractual Term)	6 years 4 months 28 days
Outstanding (Aggregate Intrinsic Value)	$ 4,004	$ 68,977
Vested and expected to vest (Aggregate Intrinsic Value)	4,004
Exercisable (Aggregate Intrinsic Value)	2,168
Vested (Aggregate Intrinsic Value)	$ 2,168

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options outstanding, including both vested and non-vested options.

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