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Stockholders' Equity - RSU Activity (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	2,824,964	3,512,286	4,553,904
Number of Shares, Granted	0	651,563	1,095,750
Number of Shares, Settled	(108,135)	(1,103,582)	(1,812,215)
Number of Shares, Cancelled	(382,503)	(235,303)	(325,153)
Number of Shares, Ending balance	2,334,326	2,824,964	3,512,286
Weighted Average Exercise Price Per Share, Beginning balance	$ 4.09	$ 3.39	$ 1.34
Weighted Average Exercise Price Per Share, Granted		$ 3.63	$ 8.54
Weighted Average Exercise Price Per Share, Settled	$ 1.27	$ 0.90	$ 0.81
Weighted Average Exercise Price Per Share, Cancelled	$ 4.77	$ 7.26	$ 6.41
Weighted Average Exercise Price Per Share, Ending balance	$ 4.11	$ 4.09	$ 3.39
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	692,504	515,834	300,000
Number of Shares, Granted	625,139	255,000	255,835
Number of Shares, Settled	(63,334)	(50,829)
Number of Shares, Cancelled	(153,006)	(27,501)	(40,001)
Number of Shares, Ending balance	1,101,303	692,504	515,834
Weighted Average Exercise Price Per Share, Beginning balance	$ 4.85	$ 6.30	$ 5.12
Weighted Average Exercise Price Per Share, Granted	$ 4.83	$ 3.15	$ 8.44
Weighted Average Exercise Price Per Share, Settled	$ 4.66	$ 7.76
Weighted Average Exercise Price Per Share, Cancelled	$ 5.03	$ 11.05	$ 11.05
Weighted Average Exercise Price Per Share, Ending balance	$ 4.71	$ 4.85	$ 6.30

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ 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)(iv)(3)

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

-Publisher SEC

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-Number 210

-Section 04

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