Net Income per Share - Computation of Basic and Diluted Net Income per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic:
Net income available for common stockholders	$ 1,767	$ 1,272	$ 3,136	$ 1,065
Weighted average shares outstanding	17,582	16,113	17,503	15,852
Basic earnings per share	$ 0.10	$ 0.08	$ 0.18	$ 0.07
Diluted:
Net income available for common stockholders	$ 1,767	$ 1,272	$ 3,136	$ 1,065
Weighted-average shares outstanding	17,582	16,113	17,503	15,852
Common stock equivalents, if diluted	483	432	427	438
Shares used in computing diluted earnings per common share	18,065	16,545	17,930	16,290
Diluted earnings per share	$ 0.10	$ 0.08	$ 0.17	$ 0.07
Shares excluded in computing diluted earnings per share as those shares would be anti-dilutive	59	182	132	177