STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		6 Months Ended
	Mar. 31, 2019	Feb. 28, 2019	Jun. 30, 2019	Jun. 30, 2018
Class Of Stock [Line Items]
Common stock, authorized shares (in shares)			40,000,000
Common stock, par value (USD per share)			$ 0.0001
Shares of common stock issued as partial consideration for services			243,000
Number of shares issued, value			$ 578	$ 472
Common Stock
Class Of Stock [Line Items]
Shares of common stock issued as partial consideration for services		200,000
Shares of common stock issued as partial consideration for services, value		$ 500
Common Stock | Private Placement
Class Of Stock [Line Items]
Number of shares issued	30,000		30,000
Number of shares issued, value	$ 100
Series C Warrants
Class Of Stock [Line Items]
Number of warrants exercised			1,000,000
Number of warrants outstanding			6,900,000
Series D Warrants
Class Of Stock [Line Items]
Number of warrants exercised			500,000
Number of warrants outstanding			11,300,000
Series E Warrants
Class Of Stock [Line Items]
Number of warrants exercised			13,200,000
Number of warrants outstanding			54,600,000