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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 68,121	$ 58,783	$ 184,446	$ 144,212
Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	66,075	48,421	180,308	127,358
Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	1,979	10,022	3,781	15,808
Managed PaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	67	340	357	1,046
North America
Disaggregation Of Revenue [Line Items]
Total net revenue	66,966	58,777	182,356	144,170
North America | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	64,920	48,415	178,218	127,316
North America | Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	1,979	10,022	3,781	15,808
North America | Managed PaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	67	340	357	1,046
Other
Disaggregation Of Revenue [Line Items]
Total net revenue	1,155	6	2,090	42
Other | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 1,155	$ 6	$ 2,090	$ 42