STOCKHOLDERS' EQUITY, Common Stock (Details) - USD ($)				3 Months Ended
	Sep. 03, 2021	Feb. 03, 2021	Aug. 05, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Common Stock [Abstract]
Common stock, shares authorized (in shares)				300,000,000		300,000,000
Common stock, par value (in dollars per share)				$ 0.0001		$ 0.0001
Common stock, shares outstanding (in shares)				196,347,529		195,813,817
Warrants outstanding (in shares)				32,811,653
Common stock, available for issuance (in shares)				70,840,818
Common stock issuable under agreement					$ 41,912,515
Net proceeds from issuance of common stock				$ 0	41,912,515
Sale Agreement [Member] | Jefferies LLC [Member]
Common Stock [Abstract]
Net proceeds from issuance of common stock					41,900,000
Sale Agreement [Member] | Jefferies LLC [Member] | Maximum [Member]
Common Stock [Abstract]
Common stock issuable under agreement			$ 50,000,000
Sale Agreement, Amended [Member] | Jefferies LLC [Member] | Maximum [Member]
Common Stock [Abstract]
Common stock issuable under agreement		$ 105,400,000
Distribution Agreement [Member] | Raymond James & Associates Inc. [Member]
Common Stock [Abstract]
Common stock issuable under agreement				$ 42,800,000
Distribution Agreement [Member] | Raymond James & Associates Inc. [Member] | Maximum [Member]
Common Stock [Abstract]
Common stock issuable under agreement	$ 50,000,000
Common Stock [Member]
Common Stock [Abstract]
Warrants outstanding (in shares)				13,631,207		4,528,160
Common stock issuable under agreement					$ 1,808
Common stock shares sold during the period (in shares)					18,080,708
Common Stock [Member] | Sale Agreement [Member] | Jefferies LLC [Member]
Common Stock [Abstract]
Common stock shares sold during the period (in shares)					18,080,708