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Stockholders' Equity - Stock Option Activity (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	2,824,964
Number of Shares, Granted
Number of Shares, Exercised	(67,226)
Number of Shares, Cancelled	(3,708)
Number of Shares, Ending balance	2,754,030	3,780,471	2,824,964
Weighted Average Exercise Price Per Share, Beginning balance	$ 4.09
Weighted-Average Exercise Price Per Share, Granted
Weighted-Average Exercise Price Per Share, Exercised	$ 1.03
Weighted-Average Exercise Price Per Share, Cancelled	$ 4.44
Weighted Average Exercise Price Per Share, Ending balance	$ 4.16	$ 3.23	$ 4.09
Weighted Average Remaining Contractual Term, Beginning balance	7 years 18 days	6 years 6 months	7 years 3 months 15 days

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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

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-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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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