Summary of Significant Accounting Policies - Net Revenue Disaggregated by Sales Channel and Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 58,783	$ 40,603	$ 144,212	$ 88,817
Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	48,421	40,026	127,358	86,398
Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	10,022	259	15,808	1,171
Managed SaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	340	318	1,046	1,248
North America
Disaggregation Of Revenue [Line Items]
Total net revenue	58,777	40,584	144,170	88,731
North America | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	48,415	40,007	127,316	86,312
North America | Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	10,022	259	15,808	1,171
North America | Managed SaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	340	318	1,046	1,248
Other
Disaggregation Of Revenue [Line Items]
Total net revenue	6	19	42	86
Other | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 6	$ 19	$ 42	$ 86