NET LOSS PER COMMON SHARE - Antidilutive Shares (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	24,171,946	18,072,393	22,147,717	18,026,005
Options
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	10,313,152	9,367,565	10,090,259	9,298,480
Convertible debt
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	11,697,952	7,113,402	10,026,309	7,113,402
Restricted stock
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	2,160,842	1,591,426	2,031,149	1,614,123