Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Unrecognized tax benefits, income tax penalties and interest expense	$ 0	$ 0	$ 0
Change in carrying amount of goodwill during period	0
COVID-19 [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred net benefit to customers	$ 2,800,000
Restricted Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Award vesting period	3 years
Total Shareholder Return Market-Based Awards and Performance Awards [Member]
Summary Of Significant Accounting Policies [Line Items]
Award vesting period	3 years
Dividend component liability, current	$ 800,000	$ 900,000
Total Shareholder Return Market-Based Awards and Performance Awards [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Common stock issued range, percent of the performance shares granted	0.00%
Total Shareholder Return Market-Based Awards and Performance Awards [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Common stock issued range, percent of the performance shares granted	200.00%