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Stockholders' Equity (Details 3) (USD $)	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Significant ranges of outstanding and exercisable options
Number of Options Outstanding	2,672,758
Weighted Average Remaining Contractual Life (in Years)	7 years 7 months 13 days
Weighted Average Exercise Price	$ 4.03
Number of Exercisable Options	1,243,244
Weighted Average Exercise Price of Exercisable Options	$ 2.86	$ 3.23
Number of Unvested Options	1,429,514
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	413,491
Weighted Average Remaining Contractual Life (in Years)	6 years 9 months 7 days
Weighted Average Exercise Price	$ 0.74
Number of Exercisable Options	413,491
Weighted Average Exercise Price of Exercisable Options	$ 0.74
Number of Unvested Options
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	365,014
Weighted Average Remaining Contractual Life (in Years)	2 years 11 months 23 days
Weighted Average Exercise Price	$ 0.94
Number of Exercisable Options	362,651
Weighted Average Exercise Price of Exercisable Options	$ 0.94
Number of Unvested Options	2,363
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	805,752
Weighted Average Remaining Contractual Life (in Years)	8 years 4 months 2 days
Weighted Average Exercise Price	$ 2.51
Number of Exercisable Options	236,430
Weighted Average Exercise Price of Exercisable Options	$ 2.60
Number of Unvested Options	569,322
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	760,751
Weighted Average Remaining Contractual Life (in Years)	8 years 11 months 27 days
Weighted Average Exercise Price	$ 5.86
Number of Exercisable Options	127,827
Weighted Average Exercise Price of Exercisable Options	$ 9.07
Number of Unvested Options	632,924
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	327,750
Weighted Average Remaining Contractual Life (in Years)	8 years 10 months 17 days
Weighted Average Exercise Price	$ 11.08
Number of Exercisable Options	102,845
Weighted Average Exercise Price of Exercisable Options	$ 11.08
Number of Unvested Options	224,905

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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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