Information about Geographic Areas - Classification of Revenue by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 30,345	$ 24,999	$ 58,033	$ 48,084
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	22,578	17,005	41,505	32,833
Europe & Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	6,308	6,392	13,508	12,150
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,459	$ 1,602	$ 3,020	$ 3,101