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Revenue From Contracts With Customers - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue From Contracts With Customers [Line Items]        
Lease revenue $ 1,073 $ 1,113 $ 2,519 $ 3,173
Accounts receivables payment terms     30 days  
Revenue remaining performance obligation amount 9,159   $ 9,159  
Other Income, Net        
Revenue From Contracts With Customers [Line Items]        
Interest income on notes receivable $ 13 $ 12 $ 42 $ 38
Minimum [Member]        
Revenue From Contracts With Customers [Line Items]        
Notes receivable interest rate 5.00%   5.00%  
Maximum        
Revenue From Contracts With Customers [Line Items]        
Notes receivable interest rate 5.75%   5.75%