STOCKHOLDERS' EQUITY - Restricted stock grants (Details) - Restricted Stock [Member]	9 Months Ended
	Sep. 30, 2019 $ / shares shares
STOCKHOLDERS' EQUITY
Shares, Unvested at beginning of year | shares	2,124,000
Shares, Grants | shares	2,380,000
Shares, Vested | shares	(2,604,000)
Shares, Forfeited/cancelled/expired | shares	(37,000)
Shares, Unvested at end of year | shares	1,863,000
Average Fair Value at Grant Date, Unvested at beginning of year (in dollars per share) | $ / shares	$ 1.85
Average Fair Value at Grant Date, Grants (in dollars per share) | $ / shares	2.15
Average Fair Value at Grant Date, Vested (in dollars per share) | $ / shares	1.92
Average Fair Value at Grant Date, Forfeited/cancelled/expired (in dollars per share) | $ / shares	2.34
Average Fair Value at Grant Date, Unvested at end of year (in dollars per share) | $ / shares	$ 2.14