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Consolidated Statement of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2018 $ 151,600   $ 230 $ 200,696 $ 127,717   $ (171,889) $ (5,154)
Beginning Balance, Shares at Dec. 31, 2018     22,951       4,631  
Issuance of common stock under stock plans, including tax effects 4,077   $ 3 4,074        
Issuance of common stock under stock plans, including tax effects, Shares     324          
Stock-based compensation expense 11,684     11,684        
Net income (loss) (9,570)       9,570      
Net change in interest rate swap, net of tax (104)             (104)
Foreign currency translation 401             401
Ending Balance at Dec. 31, 2019 158,088   $ 233 216,454 118,147   $ (171,889) (4,857)
Ending Balance, Shares at Dec. 31, 2019     23,275       4,631  
Issuance of common stock under stock plans, including tax effects 2,800   $ 3 2,797        
Issuance of common stock under stock plans, including tax effects, Shares     373          
Stock-based compensation expense 10,877     10,877        
Net income (loss) 9,990       9,990      
Net change in interest rate swap, net of tax (717)             (717)
Foreign currency translation 4,884             4,884
Ending Balance at Dec. 31, 2020 185,766   $ 236 230,128 127,981   $ (171,889) (690)
Ending Balance (ASU No. 2016-13 [Member]) at Dec. 31, 2020   $ (156)       $ (156)    
Ending Balance, Shares at Dec. 31, 2020     23,648       4,631  
Issuance of common stock under stock plans, including tax effects 5,792   $ 5 5,787        
Issuance of common stock under stock plans, including tax effects, Shares     437          
Stock-based compensation expense 10,070     10,070        
Repurchases of common stock (20,066)           $ 20,066  
Repurchase of common stock, Shares             396  
Net income (loss) 24,844       24,844      
Net change in interest rate swap, net of tax               609
Net change in interest rate swap, net of tax | ASU No. 2016-13 [Member]   $ 609            
Net change in marketable investments, net of tax (25)             (25)
Foreign currency translation (3,083)             (3,083)
Ending Balance at Dec. 31, 2021 $ 203,907   $ 241 $ 245,985 $ 152,825   $ (191,955) $ (3,189)
Ending Balance, Shares at Dec. 31, 2021     24,085       5,027