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Debt (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 03, 2020 | May 05, 2020 | Apr. 24, 2020 | Jan. 13, 2020 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 25,000 |  |
Face amount |  | $ 814,000 |  |  | $ 2,800,000 |  | $ 2,800,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 1.00% |  |  |  |  |
Proceeds from issuance of unsecured debt |  | $ 535,000 | $ 3,100,000 |  |  |  |
Term |  | 2 years |  |  |  |  |
Jack's Flight Club | Promissory Notes |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |
Amount of debt forgiven | $ 1,500,000 |  |  |  |  | $ 1,500,000 |
Repayments of debt | 6,800,000 |  |  |  |  |  |
Debt amount remaining | $ 1,700,000 |  |  |  |  |  |
Interest rate during period | 12.00% |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 142,000
Jack's Flight Club |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |
Promissory note including interest |  |  |  | $ 11,000,000.0 |  |  |
Stated interest rate |  |  |  | 1.60% |  |  |

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