Stock Based Compensation - Summary of Aggregate Equity Compensation Plan Activity (Detail) (USD $)	9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Options, Outstanding, Beginning Balance	3,272,837
Number of Options, Granted	1,292,011
Number of Options, Exercised	(12,161)
Number of Options, Forfeited	(69,591)
Number of Options, Expired	(3,889)
Number of Options, Outstanding, Ending Balance	4,483,207
Number of Options, Exercisable	2,302,226
Weighted Average Exercise Price, Outstanding	$ 5.41
Weighted Average Exercise Price, Exercisable	$ 5.93
Weighted Average Contractual Term, Outstanding	7 years 8 months 23 days
Weighted Average Contractual Term, Exercisable	6 years 3 months 29 days
Aggregate Intrinsic Value of Stock Options Outstanding	$ (19,170,641)
Aggregate Intrinsic Value of Stock Options Exercisable	$ (11,046,080)

Share Based Compensation Arrangement By Performance Units Aggregate Intrinsic Value

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Share Based Compensation Arrangement By Performance Units Weighted Average Remaining Contractual Term

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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Net 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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Number of share options (or share units) exercised during the current period.

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