STOCKHOLDERS' EQUITY, STOCK-BASED COMPENSATION AND NET LOSS PER SHARE - Summary of Nonvested Stock Options (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Weighted-Average Grant-Date Fair Value
Granted		$ 12,800
Stock Options
Shares
Non-vested, beginning of period (in shares)	244,625
Granted (in shares)	805,250
Vested (in shares)	(408,313)
Forfeited (in shares)	(31,375)
Non-vested, end of period (in shares)	610,187	244,625
Weighted-Average Grant-Date Fair Value
Non-vested, beginning of period	$ 439
Granted	335
Vested	464
Forfeited	68
Non-vested, end of period	$ 241	$ 439