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Revenue
 6 Months Ended
Jun. 30, 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 three months ended June 30, 2021 and 2020, approximately 14% and 13%, respectively, of membership revenue was derived from fees associated with members in the geographic region of two airports. For the six months ended June 30, 2021 and 2020, approximately 14% and 14%, respectively, of membership revenue was derived from fees associated with members in the geographic region of two airports.
The Company elected the practical expedient permitted to not adjust the transaction price of contracts with a duration of one year or less for the effects of a significant financing component at contract inception.
Revenue by Geography
For the three and six months ended June 30, 2021 and 2020, 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 June 30:
20212020
Balance as of January 1$101,542 $121,339 
Deferral of revenue131,895 103,542 
Recognition of deferred revenue(105,590)(121,273)
Balance as of June 30$127,847 $103,608 

The Company has obligations for refunds and other similar items of $2,258 as of June 30, 2021. The Company does not have any material variable consideration.