Geographic Information - Revenue by Geographic Region (Details) - USD ($) $ 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	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 97,049	$ 91,852	$ 85,384	$ 80,301	$ 75,221	$ 69,440	$ 63,592	$ 59,107	$ 354,586	$ 267,360	$ 187,727
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									243,616	191,204	138,876
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									77,676	53,839	34,121
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 33,294	$ 22,317	$ 14,730