Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Beginning Balance		$ 221,656	$ 203,907
Issuance of common stock under stock plans, including tax effects		$ 761	1,722
Repurchases of common stock			$ (9,459)
Repurchases of common stock, Shares		0	200,000
Stock-based compensation expense		$ 3,165	$ 3,294
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Net income (loss)		$ (4,075)	4,148
Net change in interest rate swap, net of tax			196
Net change in marketable investments, net of tax		33	(64)
Foreign currency translation		1,206	(1,314)
Ending Balance		222,746	202,430
Common Stock Member
Beginning Balance		$ 244	$ 241
Beginning Balance, Shares		24,367,000	24,085,000
Issuance of common stock under stock plans, including tax effects		$ 1
Issuance of common stock under,stock plans including tax effects, Shares		128,000	58,000
Ending Balance		$ 245	$ 241
Ending Balance, Shares		24,495,000	24,143,000
Additional Paid-in Capital Member
Beginning Balance		$ 261,766	$ 245,985
Issuance of common stock under stock plans, including tax effects		760	1,722
Stock-based compensation expense		3,165	3,294
Ending Balance		265,691	251,001
Retained Earnings Member
Beginning Balance		174,631	152,825
Net income (loss)		(4,075)	4,148
Ending Balance		170,556	156,973
Treasury Stock Member
Beginning Balance		$ (207,067)	$ (191,955)
Beginning Balance, Shares		5,305,000	5,027,000
Repurchases of common stock			$ (9,459)
Repurchases of common stock, Shares			175,000
Ending Balance		$ (207,067)	$ (201,414)
Ending Balance, Shares		5,305,000	5,202,000
Accumulated Other Comprehensive Income (Loss) Member
Beginning Balance		$ (7,918)	$ (3,189)
Net change in interest rate swap, net of tax			196
Net change in marketable investments, net of tax		33	(64)
Foreign currency translation	[1]	1,206	(1,314)
Ending Balance		$ (6,679)	$ (4,371)

[1] The Company does not record tax provisions or benefits for the net changes in foreign currency translation adjustments as it intends to permanently reinvest undistributed earnings of its foreign subsidiaries.