Segment and Geographic Information - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 16,105	$ 16,876	$ 36,160	$ 29,945
International
Segment Reporting Information [Line Items]
Total revenue	10,711	11,342	21,988	21,597
United States
Segment Reporting Information [Line Items]
Total revenue	$ 5,394	$ 5,534	$ 14,172	$ 8,348