STOCK-BASED COMPENSATION - Summary of stock option award activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Options
Beginning balance (in shares)	34,048,888
Options granted (in shares)	0
Options exercised (in shares)	(313,684)
Options canceled (in shares)	(5,006,315)
Ending balance (in shares)	28,728,889	34,048,888
Options exercisable (in shares)	24,910,195
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 10.27
Options granted (in dollars per share)	0
Options exercised (in dollars per share)	3.92
Options canceled (in dollars per share)	12.17
Ending balance (in dollars per share)	10.01	$ 10.27
Options exercisable (in dollars per share)	$ 9.31
Weighted Average Remaining Contractual Life (in years)
Options outstanding, weighted average contractual life	5 years 9 months 21 days	6 years 11 months 12 days
Options exercisable, weighted average contractual life	5 years 6 months
Aggregate Intrinsic Value (in thousands)
Beginning balance, aggregate intrinsic value	$ 16,834
Options exercised, aggregate intrinsic value	999	$ 111,000	$ 14,200
Ending balance, aggregate intrinsic value	2,073	$ 16,834
Options exercisable, aggregate intrinsic value	$ 2,073