Quarterly Financial Information (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 52,333	$ 62,716	$ 55,891	$ 48,556	$ 56,043	$ 50,630	$ 49,057	$ 46,733	$ 219,496	$ 202,463
Gross profit	15,031	18,625	15,555	14,760	19,793	17,604	17,657	15,543	63,971	70,597
Net income (loss) attributable to common stockholders	$ (13,285)	$ (8,937)	$ (10,779)	$ (7,485)	$ (4,191)	$ 10,843	$ (6,660)	$ (8,050)	$ (40,486)	$ (8,058)
Net loss per share, basic and diluted (in dollars per share)	$ (0.17)	$ (0.11)	$ (0.14)	$ (0.10)					$ (0.52)	$ (0.12)
Basic net income (loss) per share (in dollars per share)					$ (0.06)	$ 0.16	$ (0.11)	$ (0.13)
Diluted net income (loss) per share (in dollars per share)					$ (0.06)	$ 0.15	$ (0.11)	$ (0.13)