CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ DEFICIT - USD ($) $ in Thousands	Total	Common Shares	Preferred Shares	Cumulative impact of accounting change	Preferred Shares	Preferred Shares Preferred Shares	Common Shares	Common Shares Common Shares	Contributed Capital	Contributed Capital Common Shares	Contributed Capital Preferred Shares	Contributed Capital Cumulative impact of accounting change	Accumulated Deficit	Accumulated Deficit Cumulative impact of accounting change	Treasury stock	Accumulated Other Comprehensive Loss
Beginning balance (shares) at Dec. 31, 2019					0		54,709,000
Beginning balance, amount at Dec. 31, 2019	$ (7,379)			$ (105)	$ 0		$ 55		$ 452,344				$ (414,653)	$ (105)	$ (45,067)	$ (58)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(78,208)												(78,208)
Exercise of options and restricted stock awards issued (in shares)							2,858,000
Exercise of options and restricted stock awards issued	6,062						$ 3		6,059
Issuance of common stock under employee purchase plan (shares)							41,000
Issuance of common stock under employee purchase plan	359								359
Unrealized loss on investments	(2)															(2)
Foreign currency translation adjustment	151															151
Equity-based compensation	16,310								16,310
Ending balance (shares) at Dec. 31, 2020					0		57,608,000
Ending balance, amount at Dec. 31, 2020	(62,812)				$ 0		$ 58		475,072				(492,966)		(45,067)	91
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(77,702)												(77,702)
Issuance of stock (shares)						3,955,000		4,937,000
Issuance of stock		$ 32,405	$ 30,450			$ 4		$ 5		$ 32,400	$ 30,446
Cancellation of common stock (shares)							(2,643,000)
Cancellation of common stock	$ (20,300)						$ (3)		(20,297)
Exercise of options and restricted stock awards issued (in shares)	426,762						1,090,000
Exercise of options and restricted stock awards issued	$ 1,620						$ 1		1,619
Issuance of common stock under employee purchase plan (shares)							54,000
Issuance of common stock under employee purchase plan	326								326
Unrealized loss on investments	(34)															(34)
Foreign currency translation adjustment	(117)															(117)
Issuance of shares to retire Convertible Senior Notes (shares)							6,603,000
Issuance of shares to retire Convertible Senior Notes	38,903						$ 7		38,896
Equity-based compensation	22,190								22,190
Ending balance (shares) at Dec. 31, 2021					3,955,000		67,649,000
Ending balance, amount at Dec. 31, 2021	(35,071)			$ (11,516)	$ 4		$ 68		580,652			$ (37,438)	(570,668)	$ 25,922	(45,067)	(60)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (62,493)												(62,493)
Issuance of stock (shares)								17,500,000
Issuance of stock		$ 32,872						$ 17		$ 32,855
Exercise of options and restricted stock awards issued (in shares)	6,105						1,308,000
Exercise of options and restricted stock awards issued	$ 7						$ 1		6
Issuance of common stock under employee purchase plan (shares)							222,000
Issuance of common stock under employee purchase plan	224								224
Unrealized loss on investments	(14)															(14)
Foreign currency translation adjustment	(326)															(326)
Issuance of shares to retire Convertible Senior Notes (shares)							10,799,000
Issuance of shares to retire Convertible Senior Notes	10,180						$ 11		10,169
Capital contribution from related-party in connection with exchange transaction	29,847								29,847
Warrants issued to related party	3,753								3,753
Equity-based compensation	10,273								10,273
Ending balance (shares) at Dec. 31, 2022					3,955,000		97,478,000
Ending balance, amount at Dec. 31, 2022	$ (22,264)				$ 4		$ 97		$ 630,341				$ (607,239)		$ (45,067)	$ (400)