Revenue from Contracts with Customers - Major Customers (Details) - Customer Concentration Risk - Revenue	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Major customer by percent	100.00%	100.00%	100.00%
Major customer 1
Concentration Risk [Line Items]
Major customer by percent	63.00%	17.00%	0.00%
Major customer 2
Concentration Risk [Line Items]
Major customer by percent	19.00%	13.00%	0.00%
Major customer 3
Concentration Risk [Line Items]
Major customer by percent	12.00%	0.00%	0.00%
Major customer 4
Concentration Risk [Line Items]
Major customer by percent	0.00%	60.00%	80.00%
Major customer 5
Concentration Risk [Line Items]
Major customer by percent	0.00%	0.00%	10.00%
Other
Concentration Risk [Line Items]
Major customer by percent	6.00%	10.00%	10.00%