Business and Summary of Significant Accounting Policies - Summary of Revenue (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
Disaggregation of Revenue [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
Subscription revenue
Disaggregation of Revenue [Line Items]
Revenue									290,549	205,827	132,873
Perpetual license and maintenance revenue
Disaggregation of Revenue [Line Items]
Revenue									54,173	54,622	50,337
Professional services and other revenue
Disaggregation of Revenue [Line Items]
Revenue									$ 9,864	$ 6,911	$ 4,517