SHAREHOLDERS' EQUITY - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
STOCK BASED COMPENSATION
Stock options granted (in shares)	950,000	5,097,000	3,050,000
Exercise price of options granted (in dollars per share)	$ 1.22	$ 1.22	$ 1.73
Exercisable period of options	2 years 7 months 6 days
Shares
Balance at the beginning of the period (in shares)	7,012,334	5,269,000	4,243,000
Granted (in shares)	950,000	5,097,000	3,050,000
Shares of common stock issued upon exercise of stock options		135,000	535,000
Forfeited (in shares)	(1,589,000)	(1,968,000)	(700,000)
Expired (in shares)	(202,000)	(1,251,000)	(789,000)
Balance at the end of the period (in shares)	6,171,167	7,012,334	5,269,000	4,243,000
Exercisable at the end of the period (in shares)	2,265,000
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 1.55	$ 2.00	$ 2.33
Granted (in dollars per share)	1.22	1.22	1.73
Weighted average exercise price of stock options (in dollars per share)		$ 1.02	$ 1.01
Proceeds from exercise of stock options		$ 138	$ 544
Forfeited (in dollars per share)	1.46	$ 2.18	$ 2.56
Expired (in dollars per share)	7.10	1.19	2.90
Balance at the end of the period (in dollars per share)	1.34	$ 1.55	$ 2.00	$ 2.33
Exercisable (in dollars per share)	$ 1.47
Weighted Average Remaining Contractual Life
Outstanding at the end of the period	4 years 2 months 12 days	4 years 2 months 12 days	3 years	2 years
Exercisable period of options	2 years 7 months 6 days
Intrinsic Value
Outstanding at the beginning of the period (in dollars)	$ 53	$ 364	$ 1,475
Exercised (in dollars)	10	10	419
Forfeited (in dollars)	2	2
Outstanding at the end of the period (in dollars)	$ 53	$ 53	$ 364	$ 1,475
Granted (in shares)	950,000	5,097,000	3,050,000
Equity Incentive Plan
STOCK BASED COMPENSATION
Stock options granted (in shares)	0	135,000
Number of common stock reserved for issuance	17,500,000
Maximum number of shares that may be subject to grants of options to an individual in a calendar year	1,000,000
Shares
Granted (in shares)	0	135,000
Shares of common stock issued upon exercise of stock options	0
Weighted Average Exercise Price
Weighted average exercise price of stock options (in dollars per share)		$ 1.02
Proceeds from exercise of stock options		$ 100
Intrinsic Value
Granted (in shares)	0	135,000
Employees and Directors [Member]
STOCK BASED COMPENSATION
Stock options granted (in shares)	1,000,000.0	5,100,000	3,100,000
Exercise price of options granted (in dollars per share)	$ 1.22	$ 1.22	$ 1.73
Shares
Granted (in shares)	1,000,000.0	5,100,000	3,100,000
Weighted Average Exercise Price
Granted (in dollars per share)	$ 1.22	$ 1.22	$ 1.73
Intrinsic Value
Granted (in shares)	1,000,000.0	5,100,000	3,100,000
Vesting period of options	3 years
Exercise period of options	5 years
Common Stock [Member]
Shares
Shares of common stock issued upon exercise of stock options		135,000	535,000