Summary of Significant Accounting Policies - Net Revenue Disaggregated by Sales Channel and Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 68,188	$ 59,800	$ 116,324	$ 85,428
Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	68,080	53,728	114,232	78,936
Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue		5,727	1,802	5,786
PaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	108	345	290	706
North America
Disaggregation Of Revenue [Line Items]
Total net revenue	67,263	59,765	115,389	85,393
North America | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	67,155	53,693	113,297	78,901
North America | Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue		5,727	1,802	5,786
North America | PaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	108	345	290	706
Other
Disaggregation Of Revenue [Line Items]
Total net revenue	925	35	935	35
Other | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 925	$ 35	$ 935	$ 35