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Stockholders' Equity - Significant Ranges of Outstanding and Exercisable Options (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding	2,824,964
Weighted Average Remaining Contractual Life (in Years)	7 years 3 months 15 days
Weighted Average Exercise Price	$ 4.09
Number of Exercisable Options	1,454,952
Weighted Average Exercise Price of Exercisable Options	$ 3.26
Number of Unvested Options	1,370,012
$ 0.09 to $0.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	$ 0.09
Range of Exercise Prices, Upper Range	$ 0.79
Number of Options Outstanding	405,841
Weighted Average Remaining Contractual Life (in Years)	6 years 3 months 7 days
Weighted Average Exercise Price	$ 0.74
Number of Exercisable Options	405,841
Weighted Average Exercise Price of Exercisable Options	$ 0.74
$ 0.80 to $1.95 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	$ 0.80
Range of Exercise Prices, Upper Range	$ 1.95
Number of Options Outstanding	360,695
Weighted Average Remaining Contractual Life (in Years)	2 years 5 months 5 days
Weighted Average Exercise Price	$ 0.94
Number of Exercisable Options	360,695
Weighted Average Exercise Price of Exercisable Options	$ 0.94
$ 2.34 to $2.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	$ 2.34
Range of Exercise Prices, Upper Range	$ 2.60
Number of Options Outstanding	802,258
Weighted Average Remaining Contractual Life (in Years)	7 years 9 months 29 days
Weighted Average Exercise Price	$ 2.51
Number of Exercisable Options	290,015
Weighted Average Exercise Price of Exercisable Options	$ 2.60
Number of Unvested Options	512,243
$ 3.33 to $9.97 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	$ 3.33
Range of Exercise Prices, Upper Range	$ 9.97
Number of Options Outstanding	951,586
Weighted Average Remaining Contractual Life (in Years)	8 years 9 months 4 days
Weighted Average Exercise Price	$ 5.81
Number of Exercisable Options	271,013
Weighted Average Exercise Price of Exercisable Options	$ 7.17
Number of Unvested Options	680,573
$11.05 to $11.68 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	$ 11.05
Range of Exercise Prices, Upper Range	$ 11.68
Number of Options Outstanding	304,584
Weighted Average Remaining Contractual Life (in Years)	8 years 4 months 17 days
Weighted Average Exercise Price	$ 11.08
Number of Exercisable Options	127,388
Weighted Average Exercise Price of Exercisable Options	$ 11.08
Number of Unvested Options	177,196

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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