CAPITAL STOCK (Details) $ / shares in Units, $ in Thousands			1 Months Ended						6 Months Ended		40 Months Ended
	Aug. 05, 2020 shares	Oct. 31, 2019 USD ($) $ / shares shares	Jul. 31, 2020 USD ($) $ / shares shares	Feb. 29, 2020 USD ($) $ / shares shares	Jan. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares	Aug. 31, 2018 USD ($) closing $ / shares shares	Mar. 31, 2017 USD ($)	Jun. 30, 2020 USD ($) vote $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) vote $ / shares shares
Class of Stock [Line Items]
Shares authorized (in shares)									105,000,000		105,000,000
Common stock, shares authorized (in shares)						100,000,000			100,000,000		100,000,000
Preferred stock, shares authorized (in shares)									5,000,000		5,000,000
Common stock, par value (in dollars per share) | $ / shares						$ 0.01			$ 0.01		$ 0.01
Common Stock, Vote per Share | vote									1		1
Shares sold (in shares)									2,557,544
Proceeds from the sale of common stock and warrants | $									$ 19,754	$ 426
Number of warrants to purchase (in shares)						46,522			7,535,815		7,535,815
Warrant exercise price (in usd per share) | $ / shares						$ 17.93			$ 1.13		$ 1.13
Preferred stock outstanding (in shares)									0		0
Aspire Capital Fund,LLC
Class of Stock [Line Items]
Shares sold (in shares)									959,079
Aspire Stock Purchase Agreement
Class of Stock [Line Items]
Amount of shares authorized to be sold (in shares)						20,000,000.0
Sale of stock, term						30 months
Shares sold (in shares)					2,200,000				1,598,465
Sale price (in usd per share) | $ / shares									$ 0.63		$ 0.63
Transaction value | $					$ 4,100				$ 1,000
Weighted-average share price (in usd per share) | $ / shares					$ 1.84
Average over number of lowest sale prices						3 days
Number of consecutive days threshold						10 days
Aspire Stock Purchase Agreement | Common Stock
Class of Stock [Line Items]
Amount of shares required to be purchased (in shares)						200,000
Additional trading volume available for purchase, percent						30.00%
Price of additional share, percent of next business days' volume weighted average price						97.00%
Aspire Stock Purchase Agreement | Subsequent Event
Class of Stock [Line Items]
Amount of shares authorized to be sold (in shares)	10,500,000
Shares sold (in shares)			3,532,806
Transaction value | $			$ 4,400
Weighted-average share price (in usd per share) | $ / shares			$ 1.25
LLS Stock Purchase Agreement
Class of Stock [Line Items]
Amount of shares authorized to be sold (in shares)							5,000,000.0
Shares sold (in shares)		606,364					150,987
Sale price (in usd per share) | $ / shares		$ 0.82					$ 6.62
Transaction value | $							$ 5,000
Average over number of lowest sale prices							3 days
Number of separate closings | closing							5
Aggregate offering | $		$ 1,400
ATM Agreement
Class of Stock [Line Items]
Commission fee percent								3.00%
ATM Agreement | Maximum
Class of Stock [Line Items]
Aggregate offering | $								$ 50,000
ATM Agreement | Common Stock
Class of Stock [Line Items]
Shares sold (in shares)									975,063		2,846,449
Sale price (in usd per share) | $ / shares									$ 0.72		$ 0.72
Weighted-average share price (in usd per share) | $ / shares											$ 4.25
Proceeds from the sale of common stock and warrants | $									$ 700		$ 11,600
Oppenheimer
Class of Stock [Line Items]
Amount of shares authorized to be sold (in shares)				15,000,000
Proceeds from the sale of common stock and warrants | $				$ 13,900
Number of warrants to purchase (in shares)				7,500,000
Warrant exercise price (in usd per share) | $ / shares				$ 1.10
Number of shares sold per each combination (in shares)				1
Number of warrants sold per each combination (in shares)				0.50
Number of securities called by each warrant or right (in shares)				1
Combined price of instruments issued per share (in dollars per share) | $ / shares				$ 1.00