Summary of Significant Accounting Policies - Income Taxes, Inventory and Property and Equipment (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Jun. 30, 2020	Sep. 30, 2020
Accounting Policies [Abstract]
Income tax cash refunds	$ 2,700
CARES Act, cash benefits		$ 3,700
Inventory write-down		$ 18,200
Minimum
Property, Plant and Equipment [Abstract]
Property and equipment, useful life		2 years
Maximum
Property, Plant and Equipment [Abstract]
Property and equipment, useful life		39 years