CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Preferred stock	Common stock	Common stock Nonrelated Party	Common stock Related Party	Contributed capital	Contributed capital Nonrelated Party	Contributed capital Related Party	Contributed capital Cumulative effect of accounting changes	Accumulated deficit	Accumulated deficit Cumulative effect of accounting changes	Treasury stock	Accumulated other comprehensive (loss) income
Beginning balance (in shares) at Dec. 31, 2021		3,955,000
Beginning balance (in shares) at Dec. 31, 2021			6,767,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)				1,750,000
Restricted stock awards released and exercise of options (in shares)			113,000
Issuance of common stock under employee purchase plan (in shares)			16,000
Issuance of shares to retire convertible notes and derivative (in shares)			1,080,000
Ending balance (in shares) at Sep. 30, 2022		3,955,000
Ending balance (in shares) at Sep. 30, 2022			9,726,000
Beginning balance at Dec. 31, 2021		$ 4	$ 7			$ 580,714			$ (37,438)	$ (570,668)	$ 25,922	$ (45,067)	$ (60)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock				$ 2			$ 32,855
Capital contribution from modification of securities purchase agreement with related party						29,847
Exercise of options						6
Issuance of common stock under employee purchase plan						184
Issuance of shares to retire convertible notes and derivative			1			10,169
Equity-based compensation						7,825
Warrant issued to related-party						3,753
Reclassification of common stock par value due to reverse stock split						25
Net income (loss)	$ (47,884)									(47,884)
Net unrealized gain (loss) on debt securities available-for-sale	(84)												(84)
Foreign currency translation adjustment	(101)												(101)
Ending balance at Sep. 30, 2022	(9,988)	$ 4	$ 10			627,940				(592,630)		(45,067)	(245)
Beginning balance (in shares) at Jun. 30, 2022		3,955,000
Beginning balance (in shares) at Jun. 30, 2022			7,972,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)				1,750,000
Restricted stock awards released and exercise of options (in shares)			1,000
Issuance of common stock under employee purchase plan (in shares)			3,000
Ending balance (in shares) at Sep. 30, 2022		3,955,000
Ending balance (in shares) at Sep. 30, 2022			9,726,000
Beginning balance at Jun. 30, 2022		$ 4	$ 8			560,258				(576,734)		(45,067)	(432)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock				$ 2			$ 32,855
Capital contribution from modification of securities purchase agreement with related party						29,847
Issuance of common stock under employee purchase plan						47
Equity-based compensation						1,166
Warrant issued to related-party						3,753
Reclassification of common stock par value due to reverse stock split						14
Net income (loss)	(15,896)									(15,896)
Net unrealized gain (loss) on debt securities available-for-sale	48												48
Foreign currency translation adjustment	139												139
Ending balance at Sep. 30, 2022	$ (9,988)	$ 4	$ 10			627,940				(592,630)		(45,067)	(245)
Beginning balance (in shares) at Dec. 31, 2022	3,954,546	3,955,000
Beginning balance (in shares) at Dec. 31, 2022	9,747,755		9,749,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of preferred stock into common stock with related party (in shares)		(3,955,000)	396,000
Issuance of common stock (in shares)					488,000
Restricted stock awards released and exercise of options (in shares)			346,000
Issuance of shares to retire secured promissory note with related party (in shares)			3,432,000
Issuance of shares to retire convertible notes and derivative (in shares)			94,000
Ending balance (in shares) at Sep. 30, 2023	0	0
Ending balance (in shares) at Sep. 30, 2023	14,504,695		14,505,000
Beginning balance at Dec. 31, 2022	$ (22,264)	$ 4	$ 10			630,428				(607,239)		(45,067)	(400)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of preferred stock into common stock with related party		(4)
Issuance of common stock					$ 1			$ 3,996
Capital contribution from modification of securities purchase agreement with related party						1,805
Issuance of shares to retire secured promissory note with related party			3			25,363
Issuance of shares to retire convertible notes and derivative						658
Equity-based compensation						3,946
Reclassification of common stock par value due to reverse stock split						43
Net income (loss)	(48,620)									(48,620)
Net unrealized gain (loss) on debt securities available-for-sale	28												28
Foreign currency translation adjustment	12												12
Ending balance at Sep. 30, 2023	$ (35,033)	$ 0	$ 14			666,239				(655,859)		(45,067)	(360)
Beginning balance (in shares) at Jun. 30, 2023			14,358,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards released and exercise of options (in shares)			53,000
Issuance of shares to retire convertible notes and derivative (in shares)			94,000
Ending balance (in shares) at Sep. 30, 2023	0	0
Ending balance (in shares) at Sep. 30, 2023	14,504,695		14,505,000
Beginning balance at Jun. 30, 2023			$ 14			663,812				(656,769)		(45,067)	(653)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares to retire convertible notes and derivative						658
Equity-based compensation						1,769
Reclassification of common stock par value due to reverse stock split						0
Net income (loss)	$ 910									910
Net unrealized gain (loss) on debt securities available-for-sale	0
Foreign currency translation adjustment	293												293
Ending balance at Sep. 30, 2023	$ (35,033)	$ 0	$ 14			$ 666,239				$ (655,859)		$ (45,067)	$ (360)