WARRANTS, EXCHANGE (Details) $ / shares in Units, $ in Thousands			3 Months Ended	12 Months Ended
	Aug. 10, 2017 USD ($) item $ / shares shares	Aug. 09, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) shares	Aug. 11, 2017 $ / shares shares
Warrants
Derivatives gain (loss) | $				$ (2,267)	$ 593	$ (10,804)
Issuance of common stock on warrant exchange | $				3,537
Repurchase of warrants | $				40
Warrants
Warrants
Repurchase of warrants | $			$ 40	$ 40
Warrants | Derivative with Exercise Price Two
Warrants
Exercise price (in dollars per unit) | $ / shares	$ 3.87						$ 0.83
Common Stock
Warrants
Issuance of stock in exchange for warrants (in shares) | shares				2,021,419
Number of shares into which a warrant may be converted | shares			577,548	577,548		1,354,523	48,507
Common Stock | Derivative with Exercise Price Two
Warrants
Number of shares into which a warrant may be converted | shares			13,429	13,429
Warrant Exchange Agreement
Warrants
Number of times for exchange of warrants | item	3.5
Exercise price (in dollars per unit) | $ / shares	$ 3.87
Derivatives gain (loss) | $		$ (3,029)
Issuance of common stock on warrant exchange | $	$ 3,537
Warrant Exchange Agreement | Common Stock
Warrants
Issuance of stock in exchange for warrants (in shares) | shares	2,021,419
Number of shares into which a warrant may be converted | shares	577,548
Stock price (in dollars per share) | $ / shares		$ 1.75
Warrant Exchange Agreement | Fair Value | Common Stock
Warrants
Issuance of stock in exchange for warrants (in shares) | shares		2,021,419