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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings (Accumulated Deficit) [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2010 $ 202,030 $ 23 $ 206,548 $ 11,269 $ (15,810)
Beginning Balance, Shares at Sep. 30, 2010   22,938,938      
Net income (loss) (11,523)     (11,523)  
Shares issued pursuant to employee stock purchase plan 488   488    
Shares issued pursuant to employee stock purchase plan, Shares   81,615      
Shares issued upon vesting of equity awards, net of tax withholding (191)   (191)    
Shares issued upon vesting of equity awards, net of tax withholding, Shares   70,389      
Shares issued upon exercise of stock options 948   948    
Shares issued upon exercise of stock options, Shares   195,792      
Stock-based compensation 3,248   3,248    
Stock-based compensation, Shares   16,366      
Ending Balance at Sep. 30, 2011 195,000 23 211,041 (254) (15,810)
Ending Balance, Shares at Sep. 30, 2011   23,303,100      
Net income (loss) 1,099     1,099  
Shares issued pursuant to employee stock purchase plan 561   561    
Shares issued pursuant to employee stock purchase plan, Shares   101,982      
Shares issued upon vesting of equity awards, net of tax withholding (85)   (85)    
Shares issued upon vesting of equity awards, net of tax withholding, Shares   45,084      
Shares issued upon exercise of stock options 904 1 903    
Shares issued upon exercise of stock options, Shares   230,380      
Stock-based compensation 3,465   3,465    
Stock-based compensation, Shares   20,504      
Ending Balance at Sep. 30, 2012 200,944 24 215,885 845 (15,810)
Ending Balance, Shares at Sep. 30, 2012   23,701,050      
Net income (loss) 15,024     15,024  
Shares issued pursuant to employee stock purchase plan 574   574    
Shares issued pursuant to employee stock purchase plan, Shares   81,715      
Shares issued upon vesting of equity awards, net of tax withholding (157)   (157)    
Shares issued upon vesting of equity awards, net of tax withholding, Shares   32,666      
Shares issued upon exercise of stock options 2,692   2,692    
Shares issued upon exercise of stock options, Shares 504,400 504,400      
Stock-based compensation 2,735   2,735    
Stock-based compensation, Shares   16,664      
Ending Balance at Sep. 30, 2013 $ 221,812 $ 24 $ 221,729 $ 15,869 $ (15,810)
Ending Balance, Shares at Sep. 30, 2013   24,336,495