Quarterly Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 68,727	$ 49,796	$ 44,433	$ 34,361	$ 76,106	$ 63,300	$ 66,641	$ 57,170	$ 263,217	$ 197,317	$ 135,052
Gross profit	21,520	14,554	14,297	11,184	22,587	21,058	21,449	19,729	84,823	61,555	42,443
Net income (loss)	$ 2,767	$ (1,461)	$ 3,043	$ 2,208	$ 1,860	$ 3,703	$ 4,493	$ 3,021	$ 13,077	$ 6,557	$ 10,850
Basic earnings per share	$ 0.11	$ (0.07)	$ 0.17	$ 0.13	$ 0.07	$ 0.14	$ 0.18	$ 0.12	$ 0.51	$ 0.33	$ 0.73
Diluted earnings per share	$ 0.11	$ (0.07)	$ 0.17	$ 0.12	$ 0.07	$ 0.14	$ 0.17	$ 0.12	$ 0.50	$ 0.32	$ 0.65