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Debt (Details) - USD ($) $ in Thousands					3 Months Ended			12 Months Ended
	Jun. 03, 2020	May 05, 2020	Apr. 24, 2020	Jan. 13, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2020
Debt Instrument, Redemption [Line Items]
Interest expense								$ 25
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Debt Instrument, Redemption [Line Items]
Stated interest rate		1.00%
Amount of debt forgiven					$ 429
Amount received under PPP			$ 3,100
Term		2 years
Repayments of unsecured debt		$ 535
Outstanding loan and interest paid off					$ 111
Jack’s Flight Club | Promissory Notes
Debt Instrument, Redemption [Line Items]
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
Jack’s Flight Club
Debt Instrument, Redemption [Line Items]
Promissory note including interest				$ 11,000
Stated interest rate				1.60%

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