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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 59,800	$ 30,368	$ 85,428	$ 48,213
Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	53,728	29,309	78,936	46,371
Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	5,727	662	5,786	912
Managed SaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	345	397	706	930
North America
Disaggregation Of Revenue [Line Items]
Total net revenue	59,765	30,335	85,393	48,134
North America | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	53,693	29,276	78,901	46,292
North America | Wholesale
Disaggregation Of Revenue [Line Items]
Total net revenue	5,727	662	5,786	912
North America | Managed SaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	345	397	706	930
Other
Disaggregation Of Revenue [Line Items]
Total net revenue	35	33	35	79
Other | Direct
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 35	$ 33	$ 35	$ 79