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Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Beginning Balance $ 185,766 $ 158,088
Issuance of common stock under stock plans, including tax effects 2,134 1,053
Stock-based compensation expense 2,492 $ 2,802
Accounting Standards Update [Extensible List]   ASU No. 2016-13 [Member]
Net income (loss) 3,956 $ (513)
Net change in interest rate swap, net of tax 190 (1,181)
Foreign currency translation (2,301) (1,920)
Ending Balance 192,237 158,172
Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning Balance   (157)
Common Stock [Member]    
Beginning Balance $ 236 $ 233
Beginning Balance, Shares 23,648,000 23,275,000
Issuance of common stock under stock plans, including tax effects $ 2 $ 1
Issuance of common stock under,stock plans including tax effects, Shares 107,000 114,000
Ending Balance $ 238 $ 234
Ending Balance, Shares 23,755,000 23,389,000
Additional Paid-in Capital [Member]    
Beginning Balance $ 230,128 $ 216,454
Issuance of common stock under stock plans, including tax effects 2,132 1,052
Stock-based compensation expense 2,492 2,802
Ending Balance 234,752 220,308
Retained Earnings [Member]    
Beginning Balance 127,981 118,147
Net income (loss) 3,956 (513)
Ending Balance 131,937 117,477
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning Balance   (157)
Treasury Stock [Member]    
Beginning Balance $ (171,889) $ (171,889)
Beginning Balance, Shares 4,631,000 4,631,000
Ending Balance $ (171,889) $ (171,889)
Ending Balance, Shares 4,631,000 4,631,000
Accumulated Other Comprehensive Income (Loss) [Member]    
Beginning Balance $ (690) $ (4,857)
Net change in interest rate swap, net of tax 190 (1,181)
Foreign currency translation (2,301) (1,920)
Ending Balance $ (2,801) $ (7,958)