v3.21.2

General (Details) $ / shares in Units, $ in Thousands									3 Months Ended			9 Months Ended		15 Months Ended	54 Months Ended
	Oct. 13, 2021 item	Apr. 21, 2021 item	Apr. 08, 2021 item	Mar. 15, 2021 item	Mar. 08, 2021 item	Feb. 16, 2021 item	Jan. 20, 2021 item	Jan. 12, 2021 item	Dec. 31, 2021 location	Sep. 30, 2021 USD ($) location item $ / shares shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) location item segment $ / shares shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) location item $ / shares shares	Sep. 30, 2021 USD ($) location item $ / shares shares	Dec. 31, 2020 USD ($)
Number of operating segments | segment												3
Number of airports										12		12		12	12
Number of airport locations | location										11		11		11	11
Recognized revenue | $										$ 24		$ 24		$ 24	$ 24	$ 914
Lease concessions | $										585	$ 611	1,568	$ 1,379	3,600	3,600
Cash and cash equivalents | $										109,161		109,161		109,161	109,161	89,801
Total current assets | $										113,100		113,100		113,100	113,100	91,779
Total current liabilities | $										17,198		17,198		17,198	17,198	13,477
Working capital | $										$ 95,902		$ 95,902		$ 95,902	$ 95,902	$ 78,302
Number of Wellness Centers										14		14		14	14
Boston Logan International Airport [Member]
Number of separate testing rooms								4
Salt Lake City International Airport [Member]
Number of separate testing rooms							4
Newark Liberty International Airport [Member]
Number of separate testing rooms						4
Houston George Bush Intercontinental Airport [Member]
Number of separate testing rooms					4
Dulles International Airport [Member]
Number of separate testing rooms				9
Reagan National Airport [Member]
Number of separate testing rooms				4
Seattle-Tacoma International Airport [Member]
Number of separate testing rooms			8
San Francisco International Airport [Member]
Number of separate testing rooms		9
Hartsfield-Jackson Atlanta International Airport [Member]
Number of separate testing rooms	6
Minimum
Rent concession period												3 months
Maximum
Rent concession period												28 months
XpresSpa
Number of location reopenings planned | location									2
XpresSpa | Dubai International Airport [Member]
Number of operating locations | location										3		3		3	3
XpresSpa | Schiphol Amsterdam International Airport [Member]
Number of operating locations | location										3		3		3	3
Placement Agent Agreement
Cash fees paid | $												$ 2,154
December 2020 Warrants
Total of warrants exercised | shares												11,223,529
Gross proceeds | $												$ 19,161
H.C.W. Warrants
Warrants issued | shares										842,588		842,588		842,588	842,588
Cash fees paid | $												$ 2,154
Warrant exercise price | $ / shares										$ 2.125		$ 2.125		$ 2.125	$ 2.125
H.C.W. Warrants | Placement Agent Agreement
Warrants issued | shares										842,588		842,588		842,588	842,588
Warrant exercise price | $ / shares										$ 2.125		$ 2.125		$ 2.125	$ 2.125
Palladium Warrants
Warrants issued | shares										325,500		325,500		325,500	325,500
Warrant exercise price | $ / shares										$ 1.70		$ 1.70		$ 1.70	$ 1.70
Palladium Warrants | Placement Agent Agreement
Warrants issued | shares										325,500		325,500		325,500	325,500
Warrant exercise price | $ / shares										$ 1.70		$ 1.70		$ 1.70	$ 1.70

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