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, 2020	$ 141	$ 1,500,040	$ (234)	$ (980,597)	$ 519,350
Balance (in shares) at Dec. 31, 2020	140,617,606
Issuance of common stock in connection with exercise of options		128			128
Issuance of common stock in connection with exercise of options (in shares)	31,245
Issuance of restricted stock	$ 1	(1)
Issuance of restricted stock (in shares)	893,488
Forfeiture of restricted stock (in shares)	(21,643)
Offering costs paid		(183)			(183)
Compensation in respect of restricted stock granted to employees, directors and consultants		16,618			16,618
Net loss				(90,628)	$ (90,628)
Treasury stock, balance (in shares) at Mar. 31, 2021					41,309
Balance at Mar. 31, 2021	$ 142	1,516,602	(234)	(1,071,225)	$ 445,285
Balance (in shares) at Mar. 31, 2021	141,520,696
Balance at Dec. 31, 2020	$ 141	1,500,040	(234)	(980,597)	519,350
Balance (in shares) at Dec. 31, 2020	140,617,606
Net loss					$ (169,125)
Treasury stock, balance (in shares) at Jun. 30, 2021					41,309
Balance at Jun. 30, 2021	$ 143	1,532,943	(234)	(1,149,722)	$ 383,130
Balance (in shares) at Jun. 30, 2021	142,873,795
Balance at Mar. 31, 2021	$ 142	1,516,602	(234)	(1,071,225)	445,285
Balance (in shares) at Mar. 31, 2021	141,520,696
Issuance of common stock in connection with exercise of options		38			38
Issuance of common stock in connection with exercise of options (in shares)	9,364
Issuance of restricted stock	$ 1	(1)
Issuance of restricted stock (in shares)	1,356,151
Forfeiture of restricted stock (in shares)	(12,416)
Compensation in respect of restricted stock granted to employees, directors and consultants		16,304			16,304
Net loss				(78,497)	$ (78,497)
Treasury stock, balance (in shares) at Jun. 30, 2021					41,309
Balance at Jun. 30, 2021	$ 143	1,532,943	(234)	(1,149,722)	$ 383,130
Balance (in shares) at Jun. 30, 2021	142,873,795
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
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)
Treasury stock, balance (in shares) at Mar. 31, 2022					41,309
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
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
Net loss					$ (109,523)
Treasury stock, balance (in shares) at Jun. 30, 2022					41,309
Balance at Jun. 30, 2022	$ 145	1,567,345	(234)	(1,438,221)	$ 129,035
Balance (in shares) at Jun. 30, 2022	145,198,058
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
Issuance of common stock in connection with exercise of options		135			135
Issuance of common stock in connection with exercise of options (in shares)	33,044
Issuance of restricted stock	$ 2	(2)
Issuance of restricted stock (in shares)	1,830,320
Forfeiture of restricted stock	$ (2)	1			(1)
Forfeiture of restricted stock (in shares)	(1,248,640)
Compensation in respect of restricted stock granted to employees, directors and consultants		(975)			(975)
Net loss				(40,510)	$ (40,510)
Treasury stock, balance (in shares) at Jun. 30, 2022					41,309
Balance at Jun. 30, 2022	$ 145	$ 1,567,345	$ (234)	$ (1,438,221)	$ 129,035
Balance (in shares) at Jun. 30, 2022	145,198,058