COMMON STOCK, TRANSACTIONS, OTHER (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 16, 2018 shares	Jun. 30, 2019 shares	Jun. 30, 2018 shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($) shares
Common stock disclosures
Proceeds from issuance of stock under ESPP | $				$ 1	$ 3
Reverse stock split ratio	0.04
Proceeds from exercise of warrants | $					$ 10
Common Stock
Common stock disclosures
Stock issued under ESPP (in shares) | shares			2,733	1,065	188
Proceeds from issuance of stock under ESPP | $					$ 3
Reverse stock split ratio	0.04
Stock issued during period, shares, reverse stock splits | shares	2,733
Issuance of common stock upon vesting of restricted stock units (in shares) | shares		750		1,500