Accrued Expenses and Other Liabilities - Summary of Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Sales and marketing	$ 29,786	$ 25,379
Compensation and benefits	10,112	19,124
Operating lease liabilities	6,961	0
Customer deposits	2,535	2,058
Manufacturing costs	2,509	3,744
Billings in excess of revenues	992	512
Other	4,588	5,474
Total accrued expenses and other liabilities	$ 57,483	$ 56,291