STOCKHOLDERS' EQUITY - Warrants (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Registration statement
Warrants issued (in shares)	4,104,867
Net proceeds from issuance of warrants	$ 295	$ 62
Registration Statement
Registration statement
Warrant right to purchase a share of common stock (in shares)	0.25
Premium of the exercise price of the warrant as a percent to net asset value of common stock	15.00%
Series A Preferred Unit
Registration statement
Net proceeds from issuance of warrants	$ 496