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Stockholders' Equity - Significant Ranges of Outstanding and Exercisable Options (Detail) (USD $) | 12 Months Ended
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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

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- 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 + Details
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- 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 + Details
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- 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 + Details
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- 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 + Details
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- 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 + Details
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- 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 + Details
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- 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 + Details
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- 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 + Details
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