SHARE-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Inputs used in valuation of awards

The following principal inputs were used in the valuation of awards issued for the three months ended March 31, 2022 and 2021:

	Three Months Ended March 31,
	2022	2021
Expected volatility	83.4%	86.5%
Expected term (years)	5.5-6.5	5.5-7.0
Risk-free interest rate	1.9%	1.7%
Expected dividend yield	0%	0%
Value of underlying share	$1.11	$4.70

Detail of the number of stock options outstanding

Detail of the number of stock options outstanding for the three months ended March 31, 2022 under the Company's 2015 legacy option plan and the Company's amended 2018 long term incentive plan (collectively, the "Plans") is as follows:

	Number of Options	Weighted- Average Exercise Price per Option		Weighted- Average Remaining Contract Term (in years)	Aggregate Intrinsic Value
Outstanding as of December 31, 2021	3,343,883	$	3.16	7.54	$	1,039,229
Granted	2,148,832	1.56
Exercised	—	—
Forfeited (and expired)	(625,251)	6.36
Outstanding as of March 31, 2022	4,867,464	$	2.04	8.60	$	687,476
Exercisable/vested as of March 31, 2022	2,093,641	$	2.13	5.87	$	673,414

Details of the number of restricted share awards outstanding

Details of the number of restricted share units outstanding under the 2018 Plan is as follows:

	Number of Shares	Weighted- Average Grant Date Fair Value
Outstanding as of December 31, 2021	1,816,851	$	2.28
Granted	1,351,114	$	1.35
Forfeited	(482,104)	$	2.68
Vested	(77,193)	$	3.82
Shares withheld upon vesting	(38,979)	$	3.82
Outstanding as of March 31, 2022	2,569,689	$	1.69