Segment Information and Information about Geographic Areas - Net Revenues of Customer by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Net revenues, Total	$ 78,959	$ 58,441	$ 152,144	$ 112,956
North America [Member]
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Net revenues, Total	66,301	49,519	128,340	95,896
Other [Member]
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Net revenues, Total	$ 12,658	$ 8,922	$ 23,804	$ 17,060