Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Equity-based Compensation - Stock Options Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period	3 years
Contractual term	10 years
Equity Plan [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 0.9
Weighted average remaining term	1 year
General and Administrative Expense [Member] \| Equity Plan [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1.3	$ 1.2	$ 0.6