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EQUITY-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Fair Value Assumptions The fair value of the option grants awarded during each of the nine month periods ended September 30, 2021 and 2020 was $0.1 million and $0.7 million, respectively, which has been estimated with the following assumptions on the grant date.
3/10/20216/16/20219/2/2021
Risk-free interest rate1.00 %1.09 %0.93 %
Volatility    133.35 %131.06 %130.44 %
Expected life (years)    6.006.006.00
Expected dividend yield    %%%
Summary of Stock Option Activity The following table summarizes stock option activity for employees and non-employees for the nine months ended September 30, 2021 and 2020:
 SharesWeighted-Average
Exercise Price
Weighted-Average
Remaining
Contractual
Term (in years)
Aggregate
Intrinsic
Value
Outstanding at December 31, 2019166,233$34.426.53$—
Granted743,1180.61
Exercised
Forfeited(36,613)
Expired
(30,766)
Outstanding at September 30, 2020841,972$4.559.32
Exercisable at September 30, 202069,813$37.845.43$—
Outstanding at December 31, 20201,563,972$2.789.47$175,770
Granted79,000
$1.04-$1.49
Exercised
Forfeited(45,000)
Expired
Outstanding at September 30, 20211,597,972$2.758.75$271,540
Exercisable at September 30, 2021323,730$9.277.74$34,440