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Accounting for Stock- Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units issued	194,704	36,300
Number of stock options issued	208,000	73,600
Weighted average vesting period for unrecognized compensation cost			2 years 7 months 6 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award , vesting period	4 years	4 years
Fair value of the stock options granted , value	$ 603,802	$ 382,720
Weighted average grant date fair value of the stock options granted	$ 2.90	$ 5.20
Unrecognized compensation cost related to non vested stock options	$ 7,300,000		$ 7,300,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted stock options granted , value	$ 901,480	$ 262,086
Weighted average grant date fair value of the stock options granted	$ 4.63	$ 7.22
Unrecognized compensation cost related to non vested stock options	$ 8,600,000		$ 8,600,000

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Unrecognized cost of unvested share-based compensation awards.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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