Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2021		$ 372,300,000	$ 43,800,000	$ (494,100,000)	$ (78,000,000.0)
Balance, shares at Dec. 31, 2021	26,433,562
Foreign currency translation adjustments			2,400,000		2,400,000
Actuarial gains on pension plan			700,000		700,000
Reclassification of loss on hedging instrument to comprehensive income			200,000		200,000
Issuances under stock plans
Issuances under stock plans, shares	447,060
Stock-based compensation expense		2,700,000			2,700,000
Net income				1,500,000	1,500,000
Balance at Mar. 31, 2022		375,000,000.0	47,100,000	(492,600,000)	(70,500,000)
Balance, shares at Mar. 31, 2022	26,880,622
Balance at Dec. 31, 2022		378,200,000	46,300,000	(482,200,000)	(57,700,000)
Balance, shares at Dec. 31, 2022	25,909,516
Foreign currency translation adjustments			(1,700,000)		(1,700,000)
Actuarial gains on pension plan			2,000,000.0		2,000,000.0
Reclassification of loss on hedging instrument to comprehensive income			200,000		200,000
Issuances under stock plans
Issuances under stock plans, shares	353,554
Stock-based compensation expense		3,000,000.0			3,000,000.0
Net income				(200,000)	(200,000)
Balance at Mar. 31, 2023		$ 381,200,000	$ 46,800,000	$ (482,400,000)	$ (54,400,000)
Balance, shares at Mar. 31, 2023	26,263,070