Segment Information - Company's Revenue by Geographic Region, Based on Customer's Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 84,800	$ 74,435	$ 169,044	$ 146,743
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	39,527	36,701	75,931	74,346
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	19,017	14,842	36,141	28,622
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	18,456	14,596	39,694	28,302
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	7,800	8,296	17,278	15,473
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 47,327	$ 44,997	$ 93,209	$ 89,819