Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 6,191	$ 4,639
Subscription
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	389	260
Services and other
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	427	349
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	1,501	917
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	1,002	1,371
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 2,872	$ 1,742