CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2022		67,431,000
Beginning balance at Dec. 31, 2022	$ 172,354	$ 106	$ 412,708	$ (55)	$ (240,405)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(10,746)				(10,746)
Foreign currency translation gain (loss)	13			13
Actuarial loss on pension liability adjustment	0
Restricted stock unit awards vested, net of shares withheld to cover tax withholding (in shares)		1,180,000
Restricted stock unit awards vested, net of shares withheld to cover tax withholding	(1,584)	$ 1	(1,585)
Stock-based compensation	7,916		7,916
Issuance of common stock for 401K match (in shares)		777,000
Issuance of common stock for 401K match	1,942	$ 1	1,941
Ending balance (in shares) at Mar. 31, 2023		69,388,000
Ending balance at Mar. 31, 2023	$ 169,895	$ 108	420,980	(42)	(251,151)
Beginning balance (in shares) at Dec. 31, 2023	70,239,890	70,240,000
Beginning balance at Dec. 31, 2023	$ 159,003	$ 109	433,781	(60)	(274,827)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,378)				(7,378)
Foreign currency translation gain (loss)	(35)			(35)
Actuarial loss on pension liability adjustment	(30)			(30)
Restricted stock unit awards vested, net of shares withheld to cover tax withholding (in shares)		1,148,000
Restricted stock unit awards vested, net of shares withheld to cover tax withholding	(430)	$ 1	(431)
Stock-based compensation	1,648		1,648
Issuance of common stock for 401K match (in shares)		370,000
Issuance of common stock for 401K match	$ 1,618		1,618
Ending balance (in shares) at Mar. 31, 2024	71,757,998	71,758,000
Ending balance at Mar. 31, 2024	$ 154,396	$ 110	$ 436,616	$ (125)	$ (282,205)