Balance Sheet Items - Purchase Option Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BCP acquired equity position	76.00%		76.00%
Purchase Option Liability [Roll Forward]
Balance, beginning of period	$ 7,110	$ 7,110	$ 7,110	$ 10,017
Amortization expense	(7,110)	0	(7,110)	(2,907)
Balance, end of period	$ 0	$ 7,110	$ 0	$ 7,110