Summary of Stock Option Activity (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Number of Options
Outstanding | shares	779,200
Granted | shares	586,250
Exercised | shares	0
Forfeited | shares	(35,000)
Outstanding | shares	1,330,450
Exercisable | shares	679,577
Weighted Average Exercise Price
Outstanding | $ / shares	$ 12.18
Granted | $ / shares	7.14
Exercised | $ / shares	0
Forfeited | $ / shares	6.34
Outstanding | $ / shares	10.11
Exercisable | $ / shares	$ 12.56
Weighted Average Remaining Life In Years
Outstanding	8 years 4 months 24 days
Exercisable	7 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding | $	$ 0
Exercisable | $	$ 0