Shareholders' Equity - Summary of Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward
Number of Shares, Beginning Balance | shares	1,778,697
Granted, Number of Shares | shares	176,075
Exercised, Number of Shares | shares	(124,176)
Forfeited, Number of Shares | shares	(313,148)
Expired, Number of Shares | shares	(878)
Number of Shares, Ending Balance | shares	1,516,570
Vested and expected to vest, Number of Shares, Ending Balance | shares	1,445,567
Exercisable, Number of Shares, Ending Balance | shares	806,776
Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 4.43
Granted, Weighted Average Exercise Price | $ / shares	5.80
Exercised, Weighted Average Exercise Price | $ / shares	2.86
Forfeited, Weighted Average Exercise Price | $ / shares	5.22
Expired, Weighted Average Exercise Price | $ / shares	5.23
Weighted Average Exercise Price, Ending Balance | $ / shares	4.56
Vested and expected to vest, Weighted Average Exercise Price, Ending Balance | $ / shares	4.50
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 3.73
Weighted Average Remaining Contractual Life (in years)	6 years 8 months 16 days
Vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	6 years 7 months 10 days
Exercisable, Weighted Average Remaining Contractual Life (in years)	4 years 11 months 12 days
Aggregate Intrinsic Value | $	$ 2,028,252
Vested and expected to vest, Aggregate Intrinsic Value | $	1,999,111
Exercisable, Aggregate Intrinsic Value | $	$ 1,558,756