SHAREHOLDERS' EQUITY - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Apr. 26, 2017	Feb. 13, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
STOCK BASED COMPENSATION
Stock options granted (in shares)			3,050,000	375,000	338,000
Exercise price of options granted (in dollars per share)			$ 1.73	$ 1.90	$ 2.99
Exercisable period of options			1 year 2 months 12 days
Number of common stock reserved for issuance			17,500,000
Number of shares of common stock reserved for issuance			4,221,023	5,776,483
Common stock issued			400,339,000	344,560,000
Maximum number of shares that may be subject to grants of options to an individual in a calendar year			1,000,000
Shares
Balance at the beginning of the period (in shares)			4,243,000	4,906,000	4,720,000
Granted (in shares)			3,050,000	375,000	338,000
Exercised (in shares)			(535,000)	(171,000)	(94,000)
Forfeited (in shares)			(700,000)	(405,000)	(37,000)
Expired (in shares)			(789,000)	(462,000)	(21,000)
Balance at the end of the period (in shares)			5,269,000	4,243,000	4,906,000	4,720,000
Exercisable at the end of the period (in shares)			2,234,000
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)			$ 2.33	$ 2.45	$ 2.41
Granted (in dollars per share)			1.73	1.90	2.99
Exercised (in dollars per share)			$ 1.01	$ 1.02	$ 1.30
Proceeds from exercise of stock options			$ 544	$ 192	$ 121
Forfeited (in dollars per share)			$ 2.56	$ 3.99	$ 4.28
Expired (in dollars per share)			2.90	2.27	5.00
Balance at the end of the period (in dollars per share)			2.00	$ 2.33	$ 2.45	$ 2.41
Exercisable (in dollars per share)			$ 2.27
Weighted Average Remaining Contractual Life
Outstanding at the end of the period			3 years	2 years	2 years 7 months 6 days	3 years 4 months 24 days
Exercisable period of options			1 year 2 months 12 days
Intrinsic Value
Outstanding at the beginning of the period (in dollars)			$ 1,475	$ 2,564	$ 4,388
Exercised (in dollars)			419	195	87
Outstanding at the end of the period (in dollars)			364	$ 1,475	$ 2,564	$ 4,388
Exercisable at the end of the period (in dollars)			$ 364
Granted (in shares)			3,050,000	375,000	338,000
Equity Incentive Plan
STOCK BASED COMPENSATION
Common stock issued			535,000	171,000
Weighted Average Exercise Price
Exercised (in dollars per share)			$ 1.02	$ 1.02
Proceeds from exercise of stock options			$ 500	$ 200
Lexam VG Gold
STOCK BASED COMPENSATION
Share replacement awards	$ 100
Ratio of Company's share for acquired company's share		0.056%
Certain employees and directors
STOCK BASED COMPENSATION
Stock options granted (in shares)			3,100,000	400,000	300,000
Exercise price of options granted (in dollars per share)			$ 1.73	$ 1.90	$ 2.99
Shares
Granted (in shares)			3,100,000	400,000	300,000
Weighted Average Exercise Price
Granted (in dollars per share)			$ 1.73	$ 1.90	$ 2.99
Intrinsic Value
Granted (in shares)			3,100,000	400,000	300,000
Vesting period of options			3 years
Exercise period of options			5 years