Nature of Operations and Summary of Significant Accounting Policies - Revenue Disaggregated by Geographic Market (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]
Net revenue	$ 15,213	$ 1,488	$ 41,509	$ 2,565
United States
Disaggregation of Revenue [Line Items]
Net revenue	14,648	0	39,694	0
International markets
Disaggregation of Revenue [Line Items]
Net revenue	$ 565	$ 1,488	$ 1,815	$ 2,565