Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.24.0.1
Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
businessLine
mi
Dec. 31, 2023
USD ($)
businessLine
mi
Dec. 31, 2023
USD ($)
businessLine
mi
reportable_segment
Dec. 31, 2023
USD ($)
businessLine
mi
Dec. 31, 2023
USD ($)
Segment
businessLine
mi
Dec. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Disaggregation of Revenue [Line Items]              
Number of business lines | businessLine 3 3 3 3 3    
Number of reportable segments     2   2    
Deferred revenue $ 6,845 $ 6,845 $ 6,845 $ 6,845 $ 6,845 $ 6,709  
Revenue recognized   5,836       4,406  
Advertising costs   4,064       4,540  
Held-to-maturity securities balance 138,264 138,264 138,264 138,264 138,264 130,382  
Market value of held-to-maturity securities 138,285 138,285 138,285 138,285 138,285 130,352  
Other short-term investments balance 0 0 0 0 0 20,358  
Other short-term investments 0 0 0 0 0 20,460  
Allowance for credit losses $ 98 98 $ 98 $ 98 $ 98 $ 0  
Depreciation and amortization   $ 1,075         $ 830
Minimum | Passenger | Short Distance              
Disaggregation of Revenue [Line Items]              
Number of miles | mi 10 10 10 10 10    
Maximum | Restricted shares of common stock              
Disaggregation of Revenue [Line Items]              
Award vesting period 4 years            
Maximum | Passenger | Short Distance              
Disaggregation of Revenue [Line Items]              
Number of miles | mi 100 100 100 100 100    
Operating Expense | Supplier Concentration Risk | Vendor one              
Disaggregation of Revenue [Line Items]              
Concentration risk, percentage       12.00%   12.00%  
Accounts Payable | Supplier Concentration Risk | Vendor one              
Disaggregation of Revenue [Line Items]              
Concentration risk, percentage       10.00%   20.00%  
Accounts Payable | Supplier Concentration Risk | Vendor two              
Disaggregation of Revenue [Line Items]              
Concentration risk, percentage       17.00%      
Accounts Receivable | Customer Concentration Risk | Customer one              
Disaggregation of Revenue [Line Items]              
Concentration risk, percentage           13.00%