NATURE OF OPERATIONS, BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS - Reverse Stock Split (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Feb. 11, 2020	Apr. 16, 2018	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares
Cash and cash equivalents | $			$ 6,602	$ 16,660
Common stock, par value (in dollars per share) | $ / shares			$ 0.00001	$ 0.00001
Reverse stock split ratio		0.04
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. On April 16, 2018, the Company effected a reverse stock split of its common stock, par value $0.00001 per share, at a ratio of 1-for-25 (the "2018 Reverse Stock Split"). As a result of the 2018 Reverse Stock Split, (i) every 25 shares of the issued and outstanding Common Stock were automatically converted into 1 newly issued and outstanding share of Common Stock, without any change in the par value per share; (ii) 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, and (iii) the number of authorized shares of Common Stock outstanding was proportionally decreased.
Going concern			false
Subsequent event
Reverse stock split ratio	0.0333