STOCKHOLDERS EQUITY (Details Narrative) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 11, 2020	Feb. 21, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Aug. 05, 2020
Preferred stock, par value			$ 0.0001		$ 0.001
Preferred stock, outstanding			0		0
Preferred stock, shares authorized			10,000,000		10,000,000
Common stock, par value			$ 0.0001		$ 0.0001
Common stock, shares issued			123,044,981		104,902,888
Common stock, shares authorized			150,000,000		150,000,000
Common stock, shares outstanding			123,044,981		104,902,888
Underwritten public offering	23,500,000	3,525,000
Proceeds from issuance of shares	$ 82,300,000	$ 12,300,000	$ 41,912,515	$ 88,704,039
Net proceeds from the issuance of common stock		$ 88,700,000
Common stock issuable			9,874,413
Shares, Granted			1,441,050	1,158,900
Warrants outstanding			17,080,606
Weighted average exercise price of warrants			$ 2.82
Potentially dilutive securities			13,362,319	9,225,014
Restricted stock units [Member]
Potentially dilutive securities			730,994	333,500
Unrecognized compensation expense recognition period					3 years 2 months 12 days
Unrecognized compensation expense			$ 1,800,000
Compensation expense					$ 300,000
Perceptive Credit Agreement [Member]
Warrant exercise price per share			$ 3.28
Sale Agreement [Member]
Common stock issuable under agreement						50,000,000
Net proceeds			$ 41,900,000
Common stock shares sold during the period			18,080,708
Equity Incentive Plans [Member]
Unrecognized compensation expense recognition period			5 years 3 months 18 days		2 years 3 months 18 days
Description maximum number of shares reserved for grant			the Company granted Restricted Stock Units (“RSUs”) representing an aggregate of 492,744 and 341,000 shares, respectively, to certain management employees of the Company and to members of its Board of Directors. The RSUs vest annually over a period of four years for employees and semi-annually over a period of one year for directors. Total compensation expense related to unvested RSUs for the three months ended March 31, 2021 and 2020 was $0.1 million and $28,000, respectively. During the three months ended March 31, 2021, 87,750 shares vested in connection with grants of RSUs. With respect to these vested RSUs, 26,365 shares valued at approximately $59,000 were withheld by the Company to cover employees’ tax liabilities. On March 25, 2021, these shares were retired by the Company and were no longer outstanding as of March 31, 2021
Weighted average remaining contractual life of stock options outstanding					6 years 6 months
Unrecognized compensation expense			$ 5,300,000
Stock-based compensation expense					$ 2,900,000
Warrants [Member]
Potentially dilutive securities			4,528,160	2,138,160	4,528,160