Summary of Activity under Stock-Based Compensation Plans (Detail) (USD $)	9 Months Ended
Sep. 30, 2014	Dec. 31, 2013
Stock Options Number Outstanding
Beginning Balance	546,498
Granted	459,651
Cancelled or Expired	(68,544)
Exercised	(26,544)
Ending Balance	911,061
Vested or expected to vest at September 30, 2014	788,131
Exercisable at September 30, 2014	303,564
Stock Options Average Exercise Price per share
Beginning Balance	$ 14.90
Granted	$ 9.71
Cancelled or Expired	$ 18.10
Exercised	$ 10.23
Ending Balance	$ 12.18
Vested or expected to vest at September 30, 2014	$ 12.66
Exercisable at September 30, 2014	$ 18.29
Stock Options Remaining Contractual Life (in years)
Remaining Contractual Life	7 years 9 months
Vested or expected to vest at September 30, 2014	7 years 6 months
Exercisable at September 30, 2014	4 years 9 months 11 days
Stock Options Aggregate Intrinsic Value
Beginning Balance	$ 3,108,693	$ 49,015
Vested or expected to vest at September 30, 2014	2,576,617
Exercisable at September 30, 2014	$ 460,964

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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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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

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