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Stock Option Plans (Additional Information) (Detail)	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Weighted average remaining contractual term on unvested options	7 years
Exercisable Options Outstanding Shares	397,148
Weighted average exercise price per share | $ / shares	$ 6.09
Unvested Options Outstanding, Shares	525,468
Unvested Options Outstanding, Weighted average exercise price | $ / shares	$ 3.83
Unvested Options Outstanding Weighted average remaining life (yrs)	9 years 6 months
Unrecognized stock compensation expense | $	$ 1,833,333
Weighted average recognition period	2 years 1 month 6 days
Equity Option [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities	8,456
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period	15,833

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Number of shares issued during the period as a result of the conversion of convertible securities.

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