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Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity    
Balance $ 135,015 $ 111,815
Net income 3,602 4,514
Exercise of stock options, grants of restricted stock awards, and vesting of restricted stock units             1 197
Taxes paid associated with net settlement of stock compensation awards (851) (57)
Treasury Stock, Value, Acquired, Cost Method (2,963) (4,103)
Common stock surrendered in the exercise of stock options $ 0 $ 0
Common stock surrendered in the exercise of stock options (in shares) (4,678) (9,384)
Stock compensation expense   $ 1,801
Foreign currency translation   896
Balance $ 137,079 $ 115,063
Common Stock    
Increase (Decrease) in Stockholders' Equity    
Balance (in shares) 35,457,095 34,082,406
Balance $ 35 $ 34
Exercise of stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares) 131,070 151,845
Exercise of stock options, grants of restricted stock awards, and vesting of restricted stock units             $ 1  
Taxes paid associated with net settlement of stock compensation awards (in shares) (40,239) (7,703)
Forfeiture of restricted stock awards (in shares) (14,855) (13,733)
Balance (in shares) 35,533,071 34,212,815
Balance $ 36 $ 34
Additional Paid-in Capital    
Increase (Decrease) in Stockholders' Equity    
Balance 252,017 247,892
Exercise of stock options, grants of restricted stock awards, and vesting of restricted stock units               197
Taxes paid associated with net settlement of stock compensation awards (851) (57)
Common stock surrendered in the exercise of stock options 100 169
Stock compensation expense   1,801
Balance $ 253,536 $ 250,002
Treasury Stock    
Increase (Decrease) in Stockholders' Equity    
Balance (in shares) (2,222,083) (547,508,000)
Balance $ (36,628) $ (3,983)
Treasury Stock, Shares, Acquired (147,185) (309,496,000)
Treasury Stock, Value, Acquired, Cost Method $ (2,963) $ (4,103)
Common stock surrendered in the exercise of stock options $ (100) $ (169)
Common stock surrendered in the exercise of stock options (in shares) (4,678) (9,384,000)
Balance (in shares) (2,373,946) (866,388,000)
Balance $ (39,691) $ (8,255)
Accumulated Other Comprehensive Loss    
Increase (Decrease) in Stockholders' Equity    
Balance (9,011) (9,782)
Foreign currency translation   896
Balance (9,142) (8,886)
Accumulated Deficit    
Increase (Decrease) in Stockholders' Equity    
Balance (71,398) (122,346)
Net income 3,602 4,514
Balance $ (67,660) $ (117,832)