Stockholders' Equity (Deficit) - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 2,868	$ 815	$ 5,038	$ 2,231
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	179	62	334	121
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	871	241	1,511	572
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	582	186	1,216	415
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 1,236	$ 326	$ 1,977	$ 1,123