SHAREHOLDERS' EQUITY - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
STOCK BASED COMPENSATION
Number of common stock reserved for issuance	17,500,000
Number of shares of common stock reserved for issuance	3,200,483	4,963,516
Maximum number of shares that may be subject to grants of options to an individual in a calendar year	500,000
Shares
Shares of common stock issued upon exercise of stock options	0	60,000
Weighted Average Exercise Price
Weighted average exercise price of stock options (in dollars per share)		$ 1.06
Proceeds from exercise of stock options		$ 62
Common Stock and Additional Paid-in Capital
Shares
Shares of common stock issued upon exercise of stock options		60,000