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	$ (524,800,000)	$ (108,700,000)
Balance, shares at Dec. 31, 2021	26,433,562
Foreign currency translation adjustments			3,500,000		3,500,000
Actuarial loss on pension plan			100,000		100,000
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 (loss)				1,500,000	1,500,000
Balance at Mar. 31, 2022		375,000,000.0	47,600,000	(523,300,000)	(100,700,000)
Balance, shares at Mar. 31, 2022	26,880,622
Balance at Dec. 31, 2021		372,300,000	43,800,000	(524,800,000)	(108,700,000)
Balance, shares at Dec. 31, 2021	26,433,562
Foreign currency translation adjustments					12,500,000
Net income (loss)					7,900,000
Balance at Jun. 30, 2022		377,400,000	56,000,000.0	(522,000,000.0)	(88,600,000)
Balance, shares at Jun. 30, 2022	26,448,573
Balance at Mar. 31, 2022		375,000,000.0	47,600,000	(523,300,000)	(100,700,000)
Balance, shares at Mar. 31, 2022	26,880,622
Foreign currency translation adjustments			9,000,000.0		9,000,000.0
Actuarial loss on pension plan			(800,000)		(800,000)
Reclassification of loss on hedging instrument to comprehensive income			200,000		200,000
Issuances under stock plans		(200,000)			(200,000)
Issuances under stock plans, shares	45,594
Stock-based compensation expense		2,600,000			2,600,000
Net income (loss)				6,400,000	6,400,000
Repurchase of common stock				(5,100,000)	(5,100,000)
Repurchase of common stock, shares	(477,643)
Balance at Jun. 30, 2022		377,400,000	56,000,000.0	(522,000,000.0)	(88,600,000)
Balance, shares at Jun. 30, 2022	26,448,573
Balance at Dec. 31, 2022		378,200,000	50,800,000	(514,600,000)	(85,600,000)
Balance, shares at Dec. 31, 2022	25,909,516
Foreign currency translation adjustments			(2,900,000)		(2,900,000)
Actuarial loss on pension plan			200,000		200,000
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 (loss)				(1,400,000)	(1,400,000)
Balance at Mar. 31, 2023		381,200,000	48,300,000	(516,000,000.0)	(86,500,000)
Balance, shares at Mar. 31, 2023	26,263,070
Balance at Dec. 31, 2022		378,200,000	50,800,000	(514,600,000)	(85,600,000)
Balance, shares at Dec. 31, 2022	25,909,516
Foreign currency translation adjustments					(5,600,000)
Net income (loss)					4,200,000
Balance at Jun. 30, 2023		384,100,000	46,000,000.0	(510,500,000)	(80,400,000)
Balance, shares at Jun. 30, 2023	26,263,421
Balance at Mar. 31, 2023		381,200,000	48,300,000	(516,000,000.0)	(86,500,000)
Balance, shares at Mar. 31, 2023	26,263,070
Foreign currency translation adjustments			(2,700,000)		(2,700,000)
Actuarial loss on pension plan			300,000		300,000
Reclassification of loss on hedging instrument to comprehensive income			100,000		100,000
Issuances under stock plans		(200,000)			(200,000)
Issuances under stock plans, shares	4,282
Stock-based compensation expense		3,100,000			3,100,000
Net income (loss)				5,600,000	5,600,000
Repurchase of common stock				(100,000)	(100,000)
Repurchase of common stock, shares	(3,931)
Balance at Jun. 30, 2023		$ 384,100,000	$ 46,000,000.0	$ (510,500,000)	$ (80,400,000)
Balance, shares at Jun. 30, 2023	26,263,421