SHAREHOLDERS' EQUITY - Non-vested Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares
Stock options granted (in shares)	950,000	5,097,000	3,050,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value
Stock options granted (in dollars per share)	$ 1.22	$ 1.22	$ 1.73
Amended and Restated Equity Incentive Plan and Non-related Plan Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares
Balance at the beginning of the period (in shares)	6,093
Stock options granted (in shares)	950
Stock options cancelled/forfeited (in shares)	(1,339)
Stock options vested (in shares)	(1,799)
Balance at the end of the period (in shares)	3,906	6,093
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 0.44
Stock options granted (in dollars per share)	0.44
Stock options cancelled/forfeited (in dollars per share)	0.46
Stock options vested (in dollars per share)	0.45
Balance at the end of the period (in dollars per share)	$ 0.43	$ 0.44