Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
General required payment period	30 days
Receivables from contracts with customers	$ 72,000,000.0	$ 100,400,000
Allowance for doubtful accounts	$ 0	$ 0