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Stockholders' Equity - RSU Activity (Detail) (USD $)	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	2,824,964	2,672,758
Number of Shares, Granted
Number of Shares, Settled	(103,223)
Number of Shares, Cancelled	(13,678)
Number of Shares, Ending balance	2,708,063	2,672,758
Weighted Average Exercise Price Per Share, Beginning balance	$ 4.09	$ 4.03
Weighted Average Exercise Price Per Share, Granted
Weighted Average Exercise Price Per Share, Settled	$ 1.22
Weighted Average Exercise Price Per Share, Cancelled	$ 5.33
Weighted Average Exercise Price Per Share, Ending balance	$ 4.19	$ 4.03
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	692,504
Number of Shares, Granted	495,139
Number of Shares, Settled	(28,334)
Number of Shares, Cancelled	(3,837)
Number of Shares, Ending balance	1,155,472
Weighted Average Exercise Price Per Share, Beginning balance	$ 4.85
Weighted Average Exercise Price Per Share, Granted	$ 5.25
Weighted Average Exercise Price Per Share, Settled	$ 8.96
Weighted Average Exercise Price Per Share, Cancelled	$ 5.25
Weighted Average Exercise Price Per Share, Ending balance	$ 4.92

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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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-Publisher FASB

-Name Accounting Standards Codification

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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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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