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Stockholders' Equity (Details 7) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Restricted stock units activity under Company's plan
Number of Shares, beginning balance	4,553,904	4,534,328
Weighted Average Exercise Price Per Share, beginning balance	$ 1.34	$ 0.66
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
Weighted Average Exercise Price Per Share, ending balance	$ 3.39	$ 1.34
Restricted Stock Units (RSUs) [Member]
Restricted stock units activity under Company's plan
Number of Shares, beginning balance	300,000
Weighted Average Exercise Price Per Share, beginning balance	$ 5.12
Number of Shares, Granted	255,835	300,000
Weighted Average Exercise Price Per Share, Granted	$ 8.44	$ 5.12
Number of Shares, Exercised
Weighted Average Exercise Price Per Share, Exercised
Number of Shares, Cancelled	(40,001)
Weighted Average Exercise Price Per Share, Cancelled	$ 11.05
Number of Shares, ending balance	515,834	300,000
Weighted Average Exercise Price Per Share, ending balance	$ 8.34	$ 5.12

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

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