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Stockholders' Equity (Details 3) (USD $)	9 Months Ended
	Jun. 30, 2012
Significant ranges of outstanding and exercisable options
Number of Options Outstanding	3,600,865
Weighted Average Remaining Contractual Life (in Years)	6 years 8 months 5 days
Weighted Average Exercise Price	$ 3.42
Number of Exercisable Options	2,036,427
Weighted Average Exercise Price of Exercisable Options	$ 1.36
Number of Unvested Options	1,564,438
Range One [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 0.00
Range of Exercise Prices, Upper Range	$ 0.70
Number of Options Outstanding	366,162
Weighted Average Remaining Contractual Life (in Years)	5 years 6 months 18 days
Weighted Average Exercise Price	$ 0.34
Number of Exercisable Options	363,238
Weighted Average Exercise Price of Exercisable Options	$ 0.34
Number of Unvested Options	2,924
Range Two [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 0.79
Range of Exercise Prices, Upper Range	$ 0.82
Number of Options Outstanding	851,772
Weighted Average Remaining Contractual Life (in Years)	5 years 10 months 2 days
Weighted Average Exercise Price	$ 0.80
Number of Exercisable Options	663,991
Weighted Average Exercise Price of Exercisable Options	$ 0.80
Number of Unvested Options	187,781
Range Three [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 1.06
Range of Exercise Prices, Upper Range	$ 2.32
Number of Options Outstanding	729,302
Weighted Average Remaining Contractual Life (in Years)	2 years 9 months 26 days
Weighted Average Exercise Price	$ 1.21
Number of Exercisable Options	729,302
Weighted Average Exercise Price of Exercisable Options	$ 1.21
Number of Unvested Options
Range Four [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 2.60
Range of Exercise Prices, Upper Range	$ 5.90
Number of Options Outstanding	891,215
Weighted Average Remaining Contractual Life (in Years)	8 years 8 months 19 days
Weighted Average Exercise Price	$ 3.07
Number of Exercisable Options	210,955
Weighted Average Exercise Price of Exercisable Options	$ 2.71
Number of Unvested Options	680,260
Range Five [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 6.39
Range of Exercise Prices, Upper Range	$ 12.37
Number of Options Outstanding	762,414
Weighted Average Remaining Contractual Life (in Years)	9 years 5 months 27 days
Weighted Average Exercise Price	$ 10.38
Number of Exercisable Options	68,941
Weighted Average Exercise Price of Exercisable Options	$ 9.54
Number of Unvested Options	693,473

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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