NATURE OF OPERATIONS AND GOING CONCERN, BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS Reverse Stock Split (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Feb. 11, 2020 $ / shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 shares	Aug. 02, 2021 location	Dec. 31, 2020 USD ($) $ / shares
Cash and cash equivalents | $		$ 23,024			$ 19,493
Common stock, par value (in dollars per share) | $ / shares	$ 0.00001	$ 0.00001			$ 0.00001
Reverse stock split ratio	0.0333
Stock issued during period, shares, reverse stock splits | shares			7,692
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.
Going concern		false
Subsequent event
Number of clinical sites open for enrollment in study | location				18