COMMON STOCK, TRANSACTIONS, OTHER (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Feb. 11, 2020	Jan. 31, 2019 shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Common stock disclosures
Proceeds from issuance of stock under ESPP | $				$ 1
Reverse stock split ratio	0.0333
Stock issued during period, shares, reverse stock splits			7,692
Issuance of common stock upon vesting of restricted stock units (in shares)			584
Issuance of restricted common stock (in shares)				6,886
Proceeds from exercise of warrants | $			$ 343
2018 Warrants
Common stock disclosures
Shares issued on exercise of warrants				0
Proceeds from exercise of warrants | $			$ 286
Issuance of stock in exchange for warrants (in shares)			40,975
Common Stock
Common stock disclosures
Stock issued under ESPP (in shares)		36		36
Issuance of common stock upon vesting of restricted stock units (in shares)			100	143
Issuance of restricted common stock (in shares)				6,886