Quarterly Financial Information (Unaudited) - Summary of Selected Quarterly Data (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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 20,930	$ 11,556	$ 11,610	$ 10,477	$ 8,625	$ 10,993	$ 9,633	$ 9,036	$ 54,573	$ 38,287	$ 33,393
Gross profit	15,159	5,851	5,143	4,127	4,212	4,440	4,063	4,158	30,280	16,873	15,704
Operating expenses	6,042	5,674	7,420	5,865	5,335	4,156	4,976	4,279	25,001	18,746	10,960
(Loss) income from operations	9,117	177	(2,277)	(1,738)	(1,123)	284	(913)	(121)	5,279	(1,873)	4,744
Net (loss) income	$ 9,614	$ 248	$ (2,268)	$ (1,643)	$ (976)	$ 368	$ (906)	$ 18	$ 5,951	$ (1,496)	$ 4,656
Income (loss) per common share:
Basic	$ 0.89	$ 0.02	$ (0.21)	$ (0.15)	$ (0.09)	$ 0.03	$ (0.08)		$ 0.55	$ (0.14)	$ 0.42
Diluted	$ 0.88	$ 0.02	$ (0.21)	$ (0.15)	$ (0.09)	$ 0.03	$ (0.08)		$ 0.55	$ (0.14)	$ 0.39