STOCK-BASED COMPENSATION - Summary of Incentive Stock Units (Details)	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Incentive Stock Units (ISUs)
Number of Shares
Unvested at beginning of period (in shares)	5,536,925
ISUs granted (in shares)	1,847,172
ISUs vested (in shares)	(1,573,992)
ISUs forfeited (in shares)	(117,372)
Unvested at end of period (in shares)	5,692,733
Vested and unreleased (in shares)	198,856
Outstanding at end of period (in shares)	5,891,589
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in USD per share) | $ / shares	$ 4.04
ISUs granted (in USD per share) | $ / shares	4.21
ISUs vested (in USD per share) | $ / shares	4.05
ISUs forfeited (in USD per share) | $ / shares	4.01
Unvested at end of period (in USD per share) | $ / shares	$ 4.07
PSUs
Number of Shares
Unvested at beginning of period (in shares)	707,088
ISUs granted (in shares)	1,600,549
ISUs vested (in shares)	0
ISUs forfeited (in shares)	(4,756)
Unvested at end of period (in shares)	2,302,881
Vested and unreleased (in shares)	0
Outstanding at end of period (in shares)	2,302,881
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in USD per share) | $ / shares	$ 4.66
ISUs granted (in USD per share) | $ / shares	4.25
ISUs vested (in USD per share) | $ / shares	0
ISUs forfeited (in USD per share) | $ / shares	4.66
Unvested at end of period (in USD per share) | $ / shares	$ 4.38
Payout percentage	150.00%