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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended |  | 1 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2012 | Jun. 28, 2013 William Blair & Company, L.L.C [Member] | Jun. 30, 2013 William Blair & Company, L.L.C [Member] | Jun. 25, 2013 William Blair & Company, L.L.C [Member] | Jan. 31, 2012 Minimum [Member] | May 31, 2003 Minimum [Member] | Jun. 30, 2013 2012 Plan [Member] | Jun. 30, 2013 Stock options [Member] | Jun. 30, 2012 Stock options [Member] | Jun. 30, 2013 Stock options [Member] | Jun. 30, 2012 Stock options [Member] | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] 2012 Plan [Member] | Jun. 30, 2013 Restricted stock units [Member] | Jun. 30, 2013 Restricted stock units [Member] | Jun. 30, 2013 Outstanding Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares sold | 29,916,403 |  | 29,916,403 |  | 25,995,216 |  |  | 2,857,142 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, price per share |  |  |  |  |  |  |  | $ 5.25 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 13,877,447 |  |  | $ 13,877,447 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting discounts and commissions and other offering expenses |  |  |  |  |  | 1,122,549 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares of common stock to cover overallotments |  |  |  |  |  | 428,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriter option exercised |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | 7,256,141 |  | 7,256,141 |  |  |  |  |  |  |  |  | 5,006,752 |  | 5,006,752 |  |  |  |  | 2,249,388 | 2,249,388 |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 9 months 26 days |  |  |  |  |  |  | 3 years 3 months 7 days
Recognized compensation expense | 685,633 | 830,986 | 2,045,767 | 1,983,870 |  |  |  |  |  |  |  | 494,608 | 662,148 | 1,478,226 | 1,600,317 |  |  |  |  |  |
Total intrinsic value of options exercised |  |  | 3,832,374 | 14,028,720 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding | 2,670,743 | 3,600,865 | 2,670,743 | 3,600,865 | 3,512,286 |  |  |  |  |  |  |  |  |  |  | 671,254 | 515,834 | 196,254 |  |  |
Weighted-average remaining contractual term, outstanding shares |  |  | 7 years 4 months 24 days |  | 6 years 5 months 16 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price, outstanding shares | $ 4.01 |  | $ 4.01 |  | $ 3.39 |  |  |  |  |  |  |  |  |  |  | $ 4.79 | $ 6.30 |  |  |  |
Aggregate intrinsic value, outstanding shares | 7,282,518 |  | 7,282,518 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual term, exercisable shares |  |  |  | 6 years 8 months 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price, exercisable shares | $ 3.04 | $ 3.42 | $ 3.04 | $ 3.42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value, exercisable shares |  | 6,732,813 |  | 6,732,813 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance under stock holders incentive plan |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock |  |  |  |  |  |  |  |  |  | 400,000 | 1,058,521 |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants |  |  |  |  |  |  |  |  |  |  | 970,529 |  |  |  |  |  |  |  |  |  |
Recognized stock-based compensation expense related to the outstanding RSUs |  |  |  |  |  |  |  |  |  |  |  |  | $ 168,838 |  | $ 383,553 |  |  |  | $ 191,025 | $ 567,541 |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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