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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, 2011 | $ 195,000 | $ 23 | $ 211,041 | $ (254) | $ (15,810)
Beginning Balance, Shares at Sep. 30, 2011 |  | 23,303,100 |  |  |
Net income | 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 | 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 |  |  |
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 | 24,336,495 |  |  |
Net income | 11,272 |  |  | 11,272 |
Shares issued pursuant to employee stock purchase plan | 574 |  | 574 |  |
Shares issued pursuant to employee stock purchase plan, Shares |  | 55,333 |  |  |
Shares issued upon vesting of equity awards, net of tax withholding | (541) |  | (541) |  |
Shares issued upon vesting of equity awards, net of tax withholding, Shares |  | 88,729 |  |  |
Shares issued upon exercise of stock options | 3,592 | 1 | 3,591 |  |
Shares issued upon exercise of stock options, Shares | (512,147) | 512,147 |  |  |
Stock-based compensation | 2,586 |  | 2,586 |  |
Stock-based compensation, Shares |  | 10,103 |  |  |
Ending Balance at Sep. 30, 2014 | $ 239,295 | $ 25 | $ 227,939 | $ 27,141 | $ (15,810)
Ending Balance, Shares at Sep. 30, 2014 | 25,002,807 | 25,002,807 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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