Nature of Business and Summary of Significant Accounting Policies - Number of Shares Outstanding for Calculation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Basic net income and earnings per share, Numerator (Loss)	$ (51,172)	$ 5,826	$ 4,037	$ 3,055	$ (3,211)	$ (4,825)	$ 2,104	$ 198	$ (38,218)	$ (5,602)	$ 13,077
Diluted net income and earnings per share, Numerator (Loss)									$ (38,218)	$ (5,602)	$ 13,077
Basic net income and earnings per share, Denominator (Shares)									33,979,549	28,791,662	25,750,972
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan, Denominator (Shares)											446,000
Diluted net income and earnings per share Denominator (Shares)									33,979,549	28,791,662	26,196,901
Basic net income and earnings per share, Per Share Amount	$ (1.49)	$ 0.17	$ 0.12	$ 0.09	$ (0.09)	$ (0.17)	$ 0.08	$ 0.01	$ (1.12)	$ (0.19)	$ 0.51
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan, Per share amount											(0.01)
Diluted net income and earnings per share	$ (1.49)	$ 0.17	$ 0.12	$ 0.09	$ (0.09)	$ (0.17)	$ 0.08	$ 0.01	$ (1.12)	$ (0.19)	$ 0.50