Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Receivables from Stockholder [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2020	$ 153	$ 601,224	$ (6,135)		$ (586,233)	$ 9,009
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2020	152,926
Share-based compensation expense	$ 2	12,343				12,345
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture	2,235
Exercise of options	$ 1	2,539				2,540
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	1,389
Net loss					(30,575)	(30,575)
Sales of common stock	$ 8	122,885	6,135			129,028
Stock Issued During Period, Shares, New Issues	7,554
Ending balance, value at Sep. 30, 2021	$ 164	738,991			(616,808)	122,347
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2021	164,104
Beginning balance, value at Jun. 30, 2021	$ 164	736,159			(607,426)	128,897
Common Stock, Shares, Outstanding, Beginning Balance at Jun. 30, 2021	163,960
Share-based compensation expense		2,810				2,810
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture	95
Exercise of options		30				30
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	49
Net loss					(9,382)	(9,382)
Sales of common stock		(8)				(8)
Stock Issued During Period, Shares, New Issues
Ending balance, value at Sep. 30, 2021	$ 164	738,991			(616,808)	122,347
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2021	164,104
Beginning balance, value at Dec. 31, 2021	$ 164	742,042		(19)	(629,433)	$ 112,754
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2021	164,363					164,363
Share-based compensation expense	$ 1	11,934				$ 11,935
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture	997
Exercise of options	$ 1	726				727
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	525
Net loss					(39,616)	(39,616)
Other comprehensive loss				(175)		(175)
Ending balance, value at Sep. 30, 2022	$ 166	754,702		(194)	(669,049)	$ 85,625
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2022	165,885					165,885
Beginning balance, value at Jun. 30, 2022	$ 165	750,311		(178)	(656,198)	$ 94,100
Common Stock, Shares, Outstanding, Beginning Balance at Jun. 30, 2022	165,438
Share-based compensation expense		4,081				4,081
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture	240
Exercise of options	$ 1	310				311
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	207
Net loss					(12,851)	(12,851)
Other comprehensive loss				(16)		(16)
Ending balance, value at Sep. 30, 2022	$ 166	$ 754,702		$ (194)	$ (669,049)	$ 85,625
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2022	165,885					165,885