DERIVATIVE INSTRUMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				3 Months Ended	12 Months Ended
	Nov. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	May 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2019	Dec. 31, 2017
Derivative instruments
Derivative warrant liability							$ 0		$ 4
Proceeds from exercise of warrants							131
Fair value adjustment of warrants							(12,165)
Warrant reclassified to equity							14,707
Warrant Modification						$ 666	$ 765
Underwritten Public Offering, June 2018
Derivative instruments
Proceeds allocated to warrant liability			$ 13,200
Derivative warrant liability			25,200		$ 25,200
Derivative loss					$ 12,000
Reclassification of derivative warrant liability to additional paid-in capital			$ 287
Placement Agent Warrants
Derivative instruments
Warrant Exercise Price	$ 4.50
2018 Series A Warrant Exercise price
Derivative instruments
Fair value adjustment of warrants	$ 666
Warrant Exercise Price								$ 60.00
2018 Series A Warrant Exercise price | Underwritten Public Offering, June 2018
Derivative instruments
Derivative loss						1,200
Proceeds from exercise of warrants						69
Reclassification of derivative warrant liability to additional paid-in capital						$ 10,600
Warrant Exercise Price						$ 60.00
2018 Series B Warrant Exercise price | Underwritten Public Offering, June 2018
Derivative instruments
Proceeds from exercise of warrants						$ 62
Warrant Exercise Price						$ 0.30
2014 Warrant Exercise price $352.50
Derivative instruments
Fair value adjustment of warrants				$ 1
Warrant reclassified to equity				$ 1
Warrant Exercise Price						352.50
2018 Warrant Exercise price $6.98
Derivative instruments
Warrant Exercise Price	$ 6.98					$ 6.98
2018 Warrants
Derivative instruments
Fair value adjustment of warrants		$ 764
Warrant reclassified to equity		$ 14,700
2018 Warrants | Underwritten Public Offering, June 2018
Derivative instruments
Derivative loss						$ 1,200
Proceeds from exercise of warrants						131
Reclassification of derivative warrant liability to additional paid-in capital						$ 10,600
Common Stock | 2018 Series A Warrant Exercise price | Underwritten Public Offering, June 2018
Derivative instruments
Issuance of common stock upon exercise of warrants (in shares)						1,150
Common Stock | 2018 Series B Warrant Exercise price | Underwritten Public Offering, June 2018
Derivative instruments
Issuance of common stock upon exercise of warrants (in shares)						208,096