CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balances at beginning of period at Dec. 31, 2022	$ 32,714	$ 3	$ 356,010	$ (322,334)	$ (965)
Balances at beginning of period (in shares) at Dec. 31, 2022		2,871,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vesting of restricted stock units,shares (Note 7)		80,000
Issuance of common stock from vesting of restricted stock units (Note 7)	1		1
Tax withholding related to vesting of restricted stock units	(105)		(105)
Issuance of common stock under employee stock purchase plan	6		6
Issuance of common stock under employee stock purchase plan (in shares)		2,000
Stock-based compensation expense	2,362		2,362
Net loss	(11,700)			(11,700)
Foreign currency translation adjustments	(24)				(24)
Balances at end of period at Jun. 30, 2023	23,254	$ 3	358,274	(334,034)	(989)
Balances at end of period (in shares) at Jun. 30, 2023		2,953,000
Balances at beginning of period at Dec. 31, 2022	32,714	$ 3	356,010	(322,334)	(965)
Balances at beginning of period (in shares) at Dec. 31, 2022		2,871,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	21,917
Balances at end of period at Dec. 31, 2023	13,639	$ 3	358,884	(344,251)	(997)
Balances at end of period (in shares) at Dec. 31, 2023		3,011,000
Balances at beginning of period at Mar. 31, 2023	27,985	$ 3	357,069	(328,117)	(970)
Balances at beginning of period (in shares) at Mar. 31, 2023		2,873,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vesting of restricted stock units,shares (Note 7)		78,000
Issuance of common stock from vesting of restricted stock units (Note 7)	1		1
Tax withholding related to vesting of restricted stock units	(95)		(95)
Issuance of common stock under employee stock purchase plan	6		6
Issuance of common stock under employee stock purchase plan (in shares)		2,000
Stock-based compensation expense	1,293		1,293
Net loss	(5,917)			(5,917)
Foreign currency translation adjustments	(19)				(19)
Balances at end of period at Jun. 30, 2023	23,254	$ 3	358,274	(334,034)	(989)
Balances at end of period (in shares) at Jun. 30, 2023		2,953,000
Balances at beginning of period at Dec. 31, 2023	13,639	$ 3	358,884	(344,251)	(997)
Balances at beginning of period (in shares) at Dec. 31, 2023		3,011,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vesting of restricted stock units,shares (Note 7)		118,000
Tax withholding related to vesting of restricted stock units	(100)		(100)
Stock-based compensation expense	744		744
Net loss	(4,429)			(4,429)
Foreign currency translation adjustments	5				5
Balances at end of period at Jun. 30, 2024	9,859	$ 3	359,528	(348,680)	(992)
Balances at end of period (in shares) at Jun. 30, 2024		3,129,000
Balances at beginning of period at Mar. 31, 2024	11,584	$ 3	359,234	(346,662)	(991)
Balances at beginning of period (in shares) at Mar. 31, 2024		3,061,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vesting of restricted stock units,shares (Note 7)		68,000
Tax withholding related to vesting of restricted stock units	(37)		(37)
Stock-based compensation expense	331		331
Net loss	(2,018)			(2,018)
Foreign currency translation adjustments	(1)				(1)
Balances at end of period at Jun. 30, 2024	$ 9,859	$ 3	$ 359,528	$ (348,680)	$ (992)
Balances at end of period (in shares) at Jun. 30, 2024		3,129,000