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Acquisition - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 03, 2020 | Jan. 13, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairments |  |  |  |  |  |  |  |  | $ 2,100 |  |  |
Amortization expense |  |  | $ 275 | $ 275 | $ 284 |  | $ 333 |  |  | $ 833 | $ 943 | $ 1,276
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 25
Jack’s Flight Club | Promissory Notes |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt amount | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Amount of debt forgiven | 1,500 |  |  |  |  |  |  | $ 1,500 |  |  |  |
Repayments of debt | 6,800 |  |  |  |  | $ 1,700 |  | $ 6,800 |  |  |  |
Debt amount remaining | $ 1,700 |  |  |  |  |  |  |  |  |  |  |
Interest rate during period | 12.00% |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 142
Threshold amount | $ 4,300 |  |  |  |  |  |  |  |  |  |  |
EBITDA multiplier | 3.5 |  |  |  |  |  |  |  |  |  |  |
Jack’s Flight Club | Promissory Notes | 2020 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  | $ 448
Percent of net profit requirement |  |  |  |  |  | 20.00% |  |  |  |  |  | 20.00%
Jack’s Flight Club | Promissory Notes | 2021 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 492 |  |  |  |  |  |  |
Percent of net profit requirement | 20.00% |  |  |  |  |  |  |  |  |  |  |
Percent of EBITDA purchase price requirement | 40.00% |  |  |  |  |  |  |  |  |  |  |
Jack’s Flight Club |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership before transaction (up to) |  | 100.00% |  |  |  |  |  |  |  |  |  |
Stock repurchased during period, value |  | $ 12,000 |  |  |  |  |  |  |  |  |  |
Cash paid |  | 1,000 |  |  |  |  |  |  |  |  |  |
Promissory note including interest |  | $ 11,000 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.60% |  |  |  |  |  |  |  |  |  |
Goodwill impairments |  |  |  |  |  |  |  |  | 2,110 | 2,100 |  |
Intangible assets: |  | $ 6,600 |  |  |  |  |  |  |  |  |  |
Jack’s Flight Club | Trade name |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairments |  |  |  |  |  |  |  |  | $ 810 |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  |  | $ 810 |  |
Intangible assets: |  | $ 2,460 |  |  |  |  |  |  |  |  |  |
Jack’s Flight Club | Stock Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership after transaction |  | 60.00% |  |  |  |  |  |  |  | 40.00% |  |

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