Quarterly Results of Operations - Summary of Quarterly Financial Information (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]
Total revenue	$ 27,639	$ 29,560	$ 27,718	$ 32,821	$ 37,384	$ 31,539	$ 30,096	$ 23,500	$ 117,738	$ 122,518	$ 102,399
Gross profit	3,729	6,402	6,653	6,527	9,852	5,172	5,109	4,514	23,311	24,648	17,080
Income (loss) from operations	(5,710)	(2,404)	(1,348)	(1,758)	1,684	(2,476)	(2,689)	(2,745)	(11,220)	(6,235)	(16,043)
Net income (loss)	$ (5,742)	$ (3,097)	$ (1,387)	$ (1,797)	$ 1,638	$ (2,522)	$ (2,743)	$ (2,790)	$ (12,023)	$ (6,417)	$ (66,324)
Net income (loss) per share basic and diluted	$ (0.25)	$ (0.13)	$ (0.06)	$ (0.08)	$ 0.07	$ (0.11)	$ (0.12)	$ (0.12)	$ (0.52)	$ (0.28)	$ (5.37)