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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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Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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