STOCKHOLDERS' EQUITY, Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands							12 Months Ended
	Dec. 09, 2022	Oct. 25, 2021	Sep. 03, 2021	Feb. 03, 2021	Aug. 05, 2020	Feb. 21, 2020	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 27, 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)							226,063,032	221,816,930
Common stock, available for issuance (in shares)							31,033,333
Common stock shares sold during the period (in shares)		57,500,000
Common stock issuable under agreement		$ 57,500						$ 64,644	$ 121,144
Proceeds from issuance of common stock		$ 53,800					$ 0	64,645	121,144
Net proceeds from stock options exercised							1,104	$ 175	0
Maximum [Member]
Common Stock [Abstract]
Common stock, shares authorized (in shares)										300,000,000
Minimum [Member]
Common Stock [Abstract]
Common stock, shares authorized (in shares)										150,000,000
Sale Agreement [Member] | Jefferies LLC [Member] | Maximum [Member]
Common Stock [Abstract]
Common stock issuable under agreement					$ 50,000
2020 Sale Agreement [Member] | Jefferies LLC [Member]
Common Stock [Abstract]
Proceeds from issuance of common stock									60,400
Sale Agreement, Amended [Member] | Jefferies LLC [Member] | Maximum [Member]
Common Stock [Abstract]
Common stock issuable under agreement				$ 105,400
Distribution Agreement [Member] | Raymond James & Associates Inc. [Member]
Common Stock [Abstract]
Common stock issuable under agreement							$ 42,800
Proceeds from issuance of common stock									$ 6,900
Distribution Agreement [Member] | Raymond James & Associates Inc. [Member] | Maximum [Member]
Common Stock [Abstract]
Common stock issuable under agreement			$ 50,000
Common Stock [Member]
Common Stock [Abstract]
Common stock shares sold during the period (in shares)								24,125,873	90,846,029
Common stock issuable under agreement								$ 2	$ 9
Net proceeds from stock options exercised						$ 200
Stock options exercised (in shares)							1,444,533	68,679
Common Stock [Member] | Underwritten Public Offering [Member]
Common Stock [Abstract]
Common stock shares sold during the period (in shares)	24,125,873
Proceeds from issuance of common stock	$ 64,600
Common Stock [Member] | 2020 Sale Agreement [Member] | Jefferies LLC [Member]
Common Stock [Abstract]
Common stock shares sold during the period (in shares)									27,805,198
Common Stock [Member] | Distribution Agreement [Member] | Raymond James & Associates Inc. [Member]
Common Stock [Abstract]
Common stock shares sold during the period (in shares)								0	5,540,831