Summary of Significant Accounting Policies - Net Revenue Disaggregated by Sales Channel and Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 185,704	$ 114,451
Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	164,218	111,358
Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	20,150	1,408
PaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	1,336	1,685
North America
Disaggregation Of Revenue [Line Items]
Total net revenue	185,648	114,261
North America | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	164,162	111,168
North America | Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	20,150	1,408
North America | PaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	1,336	1,685
Other
Disaggregation Of Revenue [Line Items]
Total net revenue	56	190
Other | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 56	$ 190