NATURE OF OPERATIONS AND GOING CONCERN - Reverse Stock Split (Details) $ / shares in Units, $ in Thousands		2 Months Ended	12 Months Ended
	Feb. 11, 2020 $ / shares shares	Feb. 25, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Aug. 04, 2020 shares	Aug. 03, 2020 shares	Jan. 31, 2020 shares	Dec. 31, 2019 USD ($) $ / shares shares	May 31, 2018 shares
Cash and cash equivalents			$ 19,493				$ 6,602
Common stock, par value (in dollars per share) | $ / shares	$ 0.00001		$ 0.00001				$ 0.00001
Reverse stock split ratio	0.0333
Proceeds from Warrant Exercises			$ 343
Common Stock, Shares Authorized | shares	16,666,667		50,000,000	50,000,000	16,666,667	500,000,000	16,666,667	25,000,000
Stock issued during period, shares, reverse stock splits | shares			7,692
Going concern			false
Reverse stock split			On February 11, 2020, the Company effected a reverse stock split of its common stock, par value $0.00001 per share, at a ratio of 1-for-30 (the "2020 Reverse Stock Split"). As a result of the 2020 Reverse Stock Split, (i) every 30 shares of the issued and outstanding common stock were automatically converted into one newly issued and outstanding share of common stock, without any change in the par value per share; (ii) the number of shares of common stock into which each outstanding warrant or option to purchase common stock is exercisable was proportionally decreased, and (iii) the number of authorized shares of common stock outstanding was proportionally decreased. Shares of common stock underlying outstanding stock options and other equity instruments convertible into common stock were proportionately reduced and the respective exercise prices, if applicable, were proportionately increased in accordance with the terms of the agreements governing such securities.
Subsequent event
Proceeds from Warrant Exercises		$ 8,400