SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Common Shares Excluded from EPS Calculations (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of EPS	35,004,386	45,221,056
Outstanding warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of EPS	27,944,544	40,389,431
Outstanding options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of EPS	7,059,842	4,688,625
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of EPS	0	143,000