Stockholders' Equity (Details 4) (USD $)	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, beginning balance	4,553,904	4,534,328
Weighted Average Exercise Price Per Share, beginning balance	$ 1.34	$ 0.66
Weighted Average Remaining Contractual Term, beginning balance	6 years 5 months 16 days	6 years 1 month 24 days	6 years 2 months 16 days
Number of Shares, Granted	1,095,750	976,531
Weighted Average Exercise Price Per Share, Granted	$ 8.54	$ 3.70
Number of Shares, Exercised	(1,812,215)	(942,639)
Weighted Average Exercise Price Per Share, Exercised	$ 0.81	$ 0.53
Number of Shares, Cancelled	(325,153)	(14,316)
Weighted Average Exercise Price Per Share, Cancelled	$ 6.41	$ 0.57
Number of Shares, ending balance	3,512,286	4,553,904	4,534,328
Weighted Average Exercise Price Per Share, ending balance	$ 3.39	$ 1.34	$ 0.66
Weighted Average Remaining Contractual Term, ending balance	6 years 5 months 16 days	6 years 1 month 24 days	6 years 2 months 16 days

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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Gross number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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