Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2021	$ 143	$ 1,565,942	$ (234)	$ (1,328,698)	$ 237,153
Balance (in shares) at Dec. 31, 2021	143,292,043		41,309
Issuance of common stock in connection with exercise of options		125			125
Issuance of common stock in connection with exercise of options (in shares)	30,411
Issuance of restricted stock	$ 2	(2)
Issuance of restricted stock (in shares)	1,852,626
Forfeiture of restricted stock (in shares)	(591,746)
Compensation in respect of restricted stock granted to employees, directors and consultants		2,121			2,121
Net loss				(69,013)	(69,013)
Balance at Mar. 31, 2022	$ 145	1,568,186	$ (234)	(1,397,711)	170,386
Balance (in shares) at Mar. 31, 2022	144,583,334		41,309
Balance at Dec. 31, 2022	$ 146	1,585,708	$ (234)	(1,527,033)	$ 58,587
Balance (in shares) at Dec. 31, 2022	146,426,697		41,309
Treasury stock, balance (in shares) at Dec. 31, 2022					41,309
Issuance of common stock in connection with exercise of options		363			$ 363
Issuance of common stock in connection with exercise of options (in shares)	66,701
Issuance of restricted stock	$ 3	(3)
Issuance of restricted stock (in shares)	3,017,736
Warrants issued with debt financing		595			595
Forfeiture of restricted stock (in shares)	(73,787)
Compensation in respect of restricted stock granted to employees, directors and consultants		7,120			7,120
Net loss				(39,232)	$ (39,232)
Treasury stock, balance (in shares) at Mar. 31, 2023					41,309
Balance at Mar. 31, 2023	$ 149	$ 1,593,783	$ (234)	$ (1,566,265)	$ 27,433
Balance (in shares) at Mar. 31, 2023	149,437,347		41,309