Stock Compensation - Summary of Activity in Plans (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding at beginning of year	579,905
Shares, Granted	2,192
Shares, Exercised	(8,000)
Shares, Outstanding at end of period	574,097
Shares, Options exercisable at end of period	556,631
Weighted average exercise price, Outstanding at beginning of year	$ 2.52
Weighted average exercise price, Granted	$ 5.35
Weighted average exercise price, Exercised	$ 2
Weighted average exercise price, Outstanding at end of period	$ 2.54
Weighted average exercise price, Options exercisable at the end of period	$ 2.49
Aggregate intrinsic value, Outstanding at end of period	$ 1,710
Aggregate intrinsic value, Options exercisable at the end of period	$ 1,686