Summary of Significant Accounting Policies - Receivable and Related Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Other receivables and other assets due from a third-party	$ 8,000	$ 8,000
Other receivables and other assets, term		6 years
Financing receivable, gross amount, current	1,000	$ 1,000	$ 0
Financing receivable, net amount, noncurrent	7,000	7,000	0
Allowance for Credit Losses
Beginning balance, financing receivable, allowance for credit loss, current	0	0
Additions: charged to other income (expense), net, allowance for credit loss, current	(1,000)	(1,000)
Ending balance, financing receivable, allowance for credit loss, current	(1,000)	(1,000)
Beginning balance, financing receivable, allowance for credit loss, noncurrent	0	0
Additions: charged to other income (expense), net, allowance for credit loss, noncurrent	(7,000)	(7,000)
Ending balance, financing receivable, allowance for credit loss, noncurrent	(7,000)	(7,000)
Financing receivable, net amount, current	0	0	0
Financing receivable, net amount, noncurrent	$ 0	$ 0	$ 0