CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series B Preferred Stock	At-the-market Issuance	Registered Direct Offering	Preferred Stock Series A Preferred Stock	Preferred Stock Series B Preferred Stock	Common Stock	Common Stock Series A Preferred Stock	Common Stock At-the-market Issuance	Common Stock Registered Direct Offering	Treasury Stock	Additional Paid-in Capital	Additional Paid-in Capital Series B Preferred Stock	Additional Paid-in Capital At-the-market Issuance	Additional Paid-in Capital Registered Direct Offering	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020					7	0	184,133,384
Beginning balance at Dec. 31, 2020	$ 21,550				$ 0	$ 0	$ 1,841				$ (48)	$ 93,059				$ 0	$ (73,302)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	833											833
Issuance of common stock for option exercises (in shares)							157,468
Issuance of common stock for stock option exercises	176						$ 2					174
Issuance of stock (in shares)						54,745			987,000	3,000,000
Issuance of stock		$ 4,954	$ 4,849	$ 21,204		$ 1			$ 10	$ 30			$ 4,953	$ 4,839	$ 21,174
Net loss	(7,077)																(7,077)
Ending balance (in shares) at Mar. 31, 2021					7	54,745	188,277,852
Ending balance at Mar. 31, 2021	46,489				$ 0	$ 1	$ 1,883				(48)	125,032				0	(80,379)
Beginning balance (in shares) at Dec. 31, 2020					7	0	184,133,384
Beginning balance at Dec. 31, 2020	21,550				$ 0	$ 0	$ 1,841				(48)	93,059				0	(73,302)
Increase (Decrease) in Stockholders' Equity
Foreign currency translation adjustment	0
Net loss	(43,784)
Ending balance (in shares) at Sep. 30, 2021					7	54,745	199,049,329
Ending balance at Sep. 30, 2021	107,110				$ 0	$ 1	$ 1,990				(48)	222,253				0	(117,086)
Beginning balance (in shares) at Mar. 31, 2021					7	54,745	188,277,852
Beginning balance at Mar. 31, 2021	46,489				$ 0	$ 1	$ 1,883				(48)	125,032				0	(80,379)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,095											2,095
Issuance of stock (in shares)										10,000,000
Issuance of stock				$ 93,406						$ 100					$ 93,306
Issuance of common stock for stock option and warrant exercises (in shares)							538,893
Issuance of common stock for stock option and warrant exercises	371						$ 5					366
Net loss	(25,952)																(25,952)
Ending balance (in shares) at Jun. 30, 2021					7	54,745	198,816,745
Ending balance at Jun. 30, 2021	116,409				$ 0	$ 1	$ 1,988				(48)	220,799				0	(106,331)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	1,347											1,347
Issuance of common stock for option exercises (in shares)							232,584
Issuance of common stock for stock option exercises	109						$ 2					107
Foreign currency translation adjustment	0
Net loss	(10,755)																(10,755)
Ending balance (in shares) at Sep. 30, 2021					7	54,745	199,049,329
Ending balance at Sep. 30, 2021	107,110				$ 0	$ 1	$ 1,990				(48)	222,253				0	(117,086)
Beginning balance (in shares) at Dec. 31, 2021					7	54,745	199,502,183
Beginning balance at Dec. 31, 2021	95,818				$ 0	$ 1	$ 1,995				(48)	225,537				0	(131,667)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	3,299											3,299
Issuance of common stock for option exercises (in shares)							277,323
Issuance of common stock for stock option exercises	180						$ 3					177
Issuance of stock (in shares)							15,973,420
Issuance of stock	49,851						$ 160					49,691
Net loss	(18,019)																(18,019)
Ending balance (in shares) at Mar. 31, 2022					7	54,745	215,752,926
Ending balance at Mar. 31, 2022	131,129				$ 0	$ 1	$ 2,158				(48)	278,704				0	(149,686)
Beginning balance (in shares) at Dec. 31, 2021					7	54,745	199,502,183
Beginning balance at Dec. 31, 2021	$ 95,818				$ 0	$ 1	$ 1,995				(48)	225,537				0	(131,667)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock for option exercises (in shares)	1,295,999
Foreign currency translation adjustment	$ 30
Net loss	(59,412)
Ending balance (in shares) at Sep. 30, 2022					0	54,745	216,809,937
Ending balance at Sep. 30, 2022	95,303				$ 0	$ 1	$ 2,168				(48)	284,231				30	(191,079)
Beginning balance (in shares) at Mar. 31, 2022					7	54,745	215,752,926
Beginning balance at Mar. 31, 2022	131,129				$ 0	$ 1	$ 2,158				(48)	278,704				0	(149,686)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,079											2,079
Issuance of common stock for option exercises (in shares)							488,843
Issuance of common stock for stock option exercises	409						$ 5					404
Issuance of common stock upon restricted stock unit vesting, net (in shares)							26,378
Issuance of common stock upon restricted stock unit vesting, net	(48)											(48)
Series A convertible preferred stock conversion (in shares)					(7)			3,115
Foreign currency translation adjustment	10															10
Net loss	(19,471)																(19,471)
Ending balance (in shares) at Jun. 30, 2022					0	54,745	216,271,262
Ending balance at Jun. 30, 2022	114,108				$ 0	$ 1	$ 2,163				(48)	281,139				10	(169,157)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,495											2,495
Issuance of common stock for option exercises (in shares)							529,833
Issuance of common stock for stock option exercises	612						$ 5					607
Issuance of common stock upon restricted stock unit vesting, net (in shares)							8,842
Issuance of common stock upon restricted stock unit vesting, net	(10)											(10)
Foreign currency translation adjustment	20															20
Net loss	(21,922)																(21,922)
Ending balance (in shares) at Sep. 30, 2022					0	54,745	216,809,937
Ending balance at Sep. 30, 2022	$ 95,303				$ 0	$ 1	$ 2,168				$ (48)	$ 284,231				$ 30	$ (191,079)