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Stockholders' Equity (Details 3) (USD $)	3 Months Ended
	Dec. 31, 2012
Significant ranges of outstanding and exercisable options
Number of Options Outstanding	3,780,471
Weighted Average Remaining Contractual Life (in Years)	6 years 6 months 11 days
Weighted Average Exercise Price	$ 3.23
Number of Exercisable Options	2,126,294
Weighted Average Exercise Price of Exercisable Options	$ 1.55
Number of Unvested Options	1,654,177
Range One [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 0.09
Range of Exercise Prices, Upper Range	$ 0.79
Number of Options Outstanding	877,935
Weighted Average Remaining Contractual Life (in Years)	5 years 5 months 23 days
Weighted Average Exercise Price	$ 0.60
Number of Exercisable Options	846,507
Weighted Average Exercise Price of Exercisable Options	$ 0.60
Number of Unvested Options	31,428
Range Two [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 0.80
Range of Exercise Prices, Upper Range	$ 1.95
Number of Options Outstanding	946,116
Weighted Average Remaining Contractual Life (in Years)	2 years 6 months 4 days
Weighted Average Exercise Price	$ 1.12
Number of Exercisable Options	941,251
Weighted Average Exercise Price of Exercisable Options	$ 1.12
Number of Unvested Options	4,865
Range Three [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 2.34
Range of Exercise Prices, Upper Range	$ 2.60
Number of Options Outstanding	847,002
Weighted Average Remaining Contractual Life (in Years)	8 years 7 months 24 days
Weighted Average Exercise Price	$ 2.50
Number of Exercisable Options	209,633
Weighted Average Exercise Price of Exercisable Options	$ 2.60
Number of Unvested Options	637,369
Range Four [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 3.33
Range of Exercise Prices, Upper Range	$ 9.97
Number of Options Outstanding	738,668
Weighted Average Remaining Contractual Life (in Years)	9 years 1 month 28 days
Weighted Average Exercise Price	$ 5.96
Number of Exercisable Options	110,912
Weighted Average Exercise Price of Exercisable Options	$ 8.91
Number of Unvested Options	627,756
Range Five [Member]
Significant ranges of outstanding and exercisable options
Range of Exercise Prices, Lower Range	$ 11.05
Range of Exercise Prices, Upper Range	$ 11.68
Number of Options Outstanding	370,750
Weighted Average Remaining Contractual Life (in Years)	9 years 1 month 17 days
Weighted Average Exercise Price	$ 11.08
Number of Exercisable Options	17,991
Weighted Average Exercise Price of Exercisable Options	$ 11.19
Number of Unvested Options	352,759

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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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