Condensed Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands	Total	Series B Non Voting Convertible Preferred Stock	Series A Non Voting Convertible Preferred Stock	Preferred Stock Series A Non Voting Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2022		0
Beginning balance at Dec. 31, 2022		$ 0
Ending balance (in shares) at Mar. 31, 2023		0
Ending balance at Mar. 31, 2023		$ 0
Beginning balance, preferred stock (in shares) at Dec. 31, 2022				0
Beginning balance, common stock (in shares) at Dec. 31, 2022					2,614,000
Beginning balance at Dec. 31, 2022	$ 50,305			$ 0	$ 6	$ 475,971	$ (48)	$ (425,624)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with employee stock purchase plan (in shares)					2,000
Issuance of common stock in connection with employee stock purchase plan	18					18
Stock-based compensation expense	1,709					1,709
Foreign currency translation adjustment	10						10
Unrealized gain (loss) on marketable securities	32						32
Net loss	(18,422)							(18,422)
Ending balance, preferred stock (in shares) at Mar. 31, 2023				0
Ending balance, common stock (in shares) at Mar. 31, 2023					2,616,000
Ending balance at Mar. 31, 2023	$ 33,652			$ 0	$ 6	477,698	(6)	(444,046)
Beginning balance (in shares) at Dec. 31, 2023		150,000
Beginning balance at Dec. 31, 2023		$ 84,555
Series B Non-Voting Convertible Preferred Stock
Issuance of Series B non-voting convertible preferred stock in connection with private placement, net of financing costs (in shares)		122,000
Issuance of Series B non-voting convertible preferred stock in connection with private placement, net of financing costs		$ 168,850
Ending balance (in shares) at Mar. 31, 2024		271,625
Ending balance at Mar. 31, 2024		$ 253,405
Beginning balance, preferred stock (in shares) at Dec. 31, 2023	0		437,037	437,000
Beginning balance, common stock (in shares) at Dec. 31, 2023					36,057,000
Beginning balance at Dec. 31, 2023	$ 184,016			$ 184,927	$ 10	763,191	302	(764,414)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with exercise of stock options and employee stock purchase plan (in shares)					572,000
Issuance of common stock in connection with exercise of stock options and employee stock purchase plan	4,390					4,390
Stock-based compensation expense	8,385					8,385
Foreign currency translation adjustment	16						16
Unrealized gain (loss) on marketable securities	(681)						(681)
Net loss	$ (43,857)							(43,857)
Ending balance, preferred stock (in shares) at Mar. 31, 2024	0		437,037	437,000
Ending balance, common stock (in shares) at Mar. 31, 2024					36,629,000
Ending balance at Mar. 31, 2024	$ 152,269			$ 184,927	$ 10	$ 775,966	$ (363)	$ (808,271)