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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2017 $ 302,198 $ 26 $ 249,974 $ 126,759 $ (74,561)
Beginning Balance, Shares at Sep. 30, 2017   26,314,066      
Net income 4,212     4,212  
Purchase of treasury stock (695)       (695)
Shares issued pursuant to employee stock purchase plan 435 $ 1 434    
Shares issued pursuant to employee stock purchase plan, Shares   30,822      
Shares issued upon vesting of equity awards, net of minimum tax withholding (118)   (118)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   13,129      
Shares issued upon exercise of stock options 1,917   1,917    
Shares issued upon exercise of stock options, Shares   181,696      
Stock-based compensation 1,507   1,507    
Stock-based compensation, Shares   2,689      
Ending Balance at Dec. 31, 2017 309,456 $ 27 253,714 130,971 (75,256)
Ending Balance, Shares at Dec. 31, 2017   26,542,402      
Beginning Balance at Sep. 30, 2017 302,198 $ 26 249,974 126,759 (74,561)
Beginning Balance, Shares at Sep. 30, 2017   26,314,066      
Net income 27,772        
Ending Balance at Jun. 30, 2018 341,622 $ 27 262,320 154,531 (75,256)
Ending Balance, Shares at Jun. 30, 2018   26,983,074      
Beginning Balance at Dec. 31, 2017 309,456 $ 27 253,714 130,971 (75,256)
Beginning Balance, Shares at Dec. 31, 2017   26,542,402      
Net income 6,184     6,184  
Shares issued upon exercise of stock options 1,595   1,595    
Shares issued upon exercise of stock options, Shares   155,894      
Stock-based compensation 1,702   1,702    
Stock-based compensation, Shares   2,352      
Ending Balance at Mar. 31, 2018 318,937 $ 27 257,011 137,155 (75,256)
Ending Balance, Shares at Mar. 31, 2018   26,700,648      
Net income 17,376     17,376  
Shares issued pursuant to employee stock purchase plan 516   516    
Shares issued pursuant to employee stock purchase plan, Shares   36,365      
Shares issued upon exercise of stock options 3,141   3,141    
Shares issued upon exercise of stock options, Shares   243,774      
Stock-based compensation 1,652   1,652    
Stock-based compensation, Shares   2,287      
Ending Balance at Jun. 30, 2018 341,622 $ 27 262,320 154,531 (75,256)
Ending Balance, Shares at Jun. 30, 2018   26,983,074      
Beginning Balance at Sep. 30, 2018 $ 353,092 $ 27 262,250 166,071 (75,256)
Beginning Balance, Shares at Sep. 30, 2018 27,141,267 27,141,267      
Net income $ 4,910     4,910  
Purchase of treasury stock (229)       (229)
Shares issued pursuant to employee stock purchase plan 507   507    
Shares issued pursuant to employee stock purchase plan, Shares   30,650      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   35,000      
Shares issued upon exercise of stock options 1,311   1,311    
Shares issued upon exercise of stock options, Shares   108,275      
Stock-based compensation 1,448   1,448    
Stock-based compensation, Shares   2,135      
Cumulative effect of change in accounting principle - revenue recognition, net after tax 399     399  
Ending Balance at Dec. 31, 2018 361,438 $ 27 265,516 171,380 (75,485)
Ending Balance, Shares at Dec. 31, 2018   27,317,327      
Beginning Balance at Sep. 30, 2018 $ 353,092 $ 27 262,250 166,071 (75,256)
Beginning Balance, Shares at Sep. 30, 2018 27,141,267 27,141,267      
Net income $ 29,300        
Ending Balance at Jun. 30, 2019 $ 369,786 $ 27 269,554 195,770 (95,565)
Ending Balance, Shares at Jun. 30, 2019 27,355,635 27,355,635      
Beginning Balance at Dec. 31, 2018 $ 361,438 $ 27 265,516 171,380 (75,485)
Beginning Balance, Shares at Dec. 31, 2018   27,317,327      
Net income 5,303     5,303  
Shares issued upon exercise of stock options 8   8    
Shares issued upon exercise of stock options, Shares   1,000      
Stock-based compensation 1,740   1,740    
Stock-based compensation, Shares   2,900      
Ending Balance at Mar. 31, 2019 368,489 $ 27 267,264 176,683 (75,485)
Ending Balance, Shares at Mar. 31, 2019   27,321,227      
Net income 19,087     19,087  
Purchase of treasury stock (20,080)       (20,080)
Shares issued pursuant to employee stock purchase plan 515   515    
Shares issued pursuant to employee stock purchase plan, Shares   31,637      
Stock-based compensation 1,775   1,775    
Stock-based compensation, Shares   2,771      
Ending Balance at Jun. 30, 2019 $ 369,786 $ 27 $ 269,554 $ 195,770 $ (95,565)
Ending Balance, Shares at Jun. 30, 2019 27,355,635 27,355,635