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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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