Revenue

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue

Revenue

The Company derives substantially all of its revenue from subscriptions to its consumer aviation service, CLEAR Plus. For the years ended December 31, 2021 and 2020, no individual airport accounted for more than 10% of membership revenue.

Revenue by Geography

For the years ended December 31, 2021 and 2020, substantially all of the Company’s revenue was generated in the United States.

Contract liabilities and assets

The Company’s deferred revenue balance primarily relates to amounts received from customers for subscriptions paid in advance of the services being provided that will be earned within the next twelve months. The following table presents changes in the deferred revenue balance as of December 31:

	2021		2020		2019
Balance as of January 1	$	101,542	$	121,339	$	77,696
Deferral of revenue	$	339,064	210,174		233,561
Recognition of deferred revenue	(252,043)		(229,971)		(189,918)
Balance as of December 31	$	188,563	$	101,542	$	121,339

The Company has obligations for refunds and other similar items of $2,661 as of December 31, 2021 recorded within accrued liabilities. The Company does not have any material variable consideration obligations.