Shareholders' Equity - Summary of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward
Number of Shares, Beginning Balance	1,553,360
Granted, Number of Shares	556,350
Exercised, Number of Shares	(187,350)
Forfeited, Number of Shares	(63,941)
Expired, Number of Shares	(7,001)
Number of Shares, Ending Balance	1,851,418
Vested and expected to vest, Number of Shares, Ending Balance	1,702,830
Exercisable, Number of Shares, Ending Balance	714,893
Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 3.50
Granted, Weighted Average Exercise Price | $ / shares	6.33
Exercised, Weighted Average Exercise Price | $ / shares	2.99
Forfeited, Weighted Average Exercise Price | $ / shares	3.52
Expired, Weighted Average Exercise Price | $ / shares	2.66
Weighted Average Exercise Price, Ending Balance | $ / shares	4.40
Vested and expected to vest, Weighted Average Exercise Price, Ending Balance | $ / shares	4.32
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 3.62
Weighted Average Remaining Contractual Life (in years)	7 years 7 months 28 days
Vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	7 years 6 months 4 days
Exercisable, Weighted Average Remaining Contractual Life (in years)	5 years 6 months 11 days
Aggregate Intrinsic Value | $	$ 4,131,502
Vested and expected to vest, Aggregate Intrinsic Value | $	3,945,697
Exercisable, Aggregate Intrinsic Value | $	$ 2,155,288