FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Warrants exercised			119,420
Change in fair value of Level 3 financial liabilities			$ (4,701,000)	$ 3,301,000
2016 and 2017 Private Placement Warrants
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Warrants exercised			119,420	0
Aggregate fair value of warrants upon exercise			$ 400,000
Change in fair value of Level 3 financial liabilities	$ (3,800,000)	$ 400,000	(4,700,000)	$ 3,300,000
Transfers between Level 1 to Level 2	0	0	0	0
Transfers between Level 2 to Level 1	0	0	0	0
Transfers into or out of Level 3	$ 0	$ 0	$ 0	$ 0