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Stockholders' Equity (Details 2) (USD $)	9 Months Ended
	Jun. 30, 2012
Stock option activity under the Company's equity plans
Number of Shares, Outstanding, September 30, 2011	4,553,904
Number of Shares, Granted	913,250
Number of Shares, Exercised	(1,734,333)
Number of Shares, Cancelled	(131,956)
Number of Shares, Outstanding, June 30, 2012	3,600,865
Weighted Average Exercise Price Per Share, Outstanding, September 30, 2011	$ 1.34
Weighted Average Exercise Price Per Share, Granted	$ 9.40
Weighted Average Exercise Price Per Share, Exercised	$ 0.77
Weighted Average Exercise Price Per Share, Cancelled	$ 7.67
Weighted Average Exercise Price Per Share, Outstanding, June 30, 2012	$ 3.42
Weighted Average Remaining Contractual Term (in Years), Outstanding, September 30, 2011	6 years 1 month 24 days
Weighted Average Remaining Contractual Term (in Years), Outstanding, June 30, 2012	6 years 8 months 5 days

X

- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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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