ORGANIZATION AND OPERATIONS (Details) $ / shares in Units, $ in Millions		1 Months Ended
	Sep. 03, 2019 $ / shares	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 $ / shares shares	Jun. 29, 2020 $ / shares	Jun. 28, 2020 $ / shares	Feb. 29, 2020 $ / shares	Jan. 31, 2020 $ / shares shares	Nov. 21, 2017 $ / shares
Class of Stock [Line Items]
Common stock, par value (in usd per share)	$ 0.003	$ 0.001	$ 0.001
Common stock, shares authorized (in shares) | shares		900,000,000	900,000,000
Preferred stock, shares authorized (in shares) | shares		100,000,000
Reverse stock split ratio, common stock	0.3333
Reduction to additional paid-in capital, due to offering costs incurred | $		$ 1.9
Registration Statement
Class of Stock [Line Items]
Warrant right to purchase a share of common stock (in shares) | shares							0.25
Rights Offering
Class of Stock [Line Items]
Purchase price (in usd per share)		$ 9.25
Sale of stock, number of shares issued | shares		8,521,589
Consideration received on transaction | $		$ 78.8
Series L Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in usd per share)		$ 0.001	$ 0.001
Preferred stock, liquidation preference per share (in usd per share)		28.37	28.37
Series L Preferred Stock | Registration Statement
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in usd per share)								$ 28.37
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in usd per share)		0.001	0.001
Preferred stock, liquidation preference per share (in usd per share)		25.00	25.00
Series A Preferred Stock | Registration Statement
Class of Stock [Line Items]
Preferred stock, par value (in usd per share)							$ 0.001
Preferred stock, stated value (in usd per share)							$ 25.00
Series A Preferred Stock | Continuous Public Offering
Class of Stock [Line Items]
Purchase price (in usd per share)						$ 25.00
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in usd per share)		0.001	0.001			0.001
Preferred stock, liquidation preference per share (in usd per share)		$ 25.00	$ 25.00			25.00
Series D Preferred Stock | Continuous Public Offering
Class of Stock [Line Items]
Purchase price (in usd per share)				$ 24.50	$ 25.00	$ 25.00