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STOCK-BASED COMPENSATION - Summary of Incentive Stock Units (Detail) - Incentive Stock Units (ISUs)
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]  
Unvested at December 31, 2020, Number of Shares 8,046,399
ISUs granted, Number of Shares 3,178,689
ISUs vested, Number of Shares (3,509,497)
ISUs forfeited, Number of Shares (178,503)
Unvested at June 30, 2021, Number of Shares 7,537,088
Vested and unreleased, Number of Shares 172,692
Outstanding at June 30, 2021, Number of Shares 7,709,780
Unvested at December 31, 2020, Weighted Average Grant Date Fair Value | $ / shares $ 3.41
ISUs granted, Weighted Average Grant Date Fair Value | $ / shares 4.78
ISUs vested, Weighted Average Grant Date Fair Value | $ / shares 4.82
ISUs forfeited, Weighted Average Grant Date Fair Value | $ / shares 3.34
Unvested at June 30, 2021, Weighted Average Grant Date Fair Value | $ / shares $ 3.99