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Revenue, Accounts Receivable and Significant Customers

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Revenue, Accounts Receivable and Significant Customers
 3 Months Ended
Mar. 31, 2024
Revenue From Contract With Customer, Accounts Receivable, And Concentration Risk [Abstract]  
Revenue, Accounts Receivable and Significant Customers Revenue, Accounts Receivable and Significant Customers
The Company derives nearly all of its revenue through a recurring subscription model. The Company enters into contracts with its customers that typically have an initial term of one year. Most customers are invoiced in advance and must generally pay an upfront implementation fee. The upfront implementation fee is deferred and recognized over the initial contract term and any customer prepayments are deferred and included in the accompanying consolidated balance sheets in deferred revenue. Revenues are recognized over time as we provide our services to our customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services.
Changes in the contract liability, which solely includes deferred revenue, were as follows:

Three Months Ended March 31, 2024 Year Ended December 31, 2023
Balance, beginning of period $ 8,963  $ 7,254 
Deferral of revenue 11,807  42,846 
Recognition of unearned revenue (11,756) (41,137)
Balance, end of period $ 9,014  $ 8,963 

Deferred revenues consist of billings or payments received in advance of revenue recognized for the Company’s services, as described above, and are recognized as revenue when earned. The Company has an unconditional right to payment under a non-cancellable contract before it transfers services to its customer.
The Company’s accounts receivable are derived from contracts with customers located in the U.S. Significant customers generating more than 10% of the Company's revenue during the period indicated or for which accounts receivable balance was more than 10% of the total accounts receivable balance were as follows:
Percent of Revenue for three months ended March 31,
2024 2023
Customer A 29  % 18  %
Customer B 11  % 14  %
Customer C 10  % 13  %
Percent of Accounts Receivable
March 31, 2024 December 31, 2023
Customer A 32  % 35  %
Customer C 12  % 11  %
Customer D 10  % n/a
Customer E n/a 10  %
The Company capitalizes sales commission costs to obtain a revenue contract and amortizes such costs over 12 to 24 months. The Company amortized $137 thousand and $157 thousand of sales commissions in sales and marketing expense during the three months ended March 31, 2024 and 2023, respectively. The unamortized capitalized sales commission included in prepaid expenses and other current assets was $503 thousand and $494 thousand as of March 31, 2024 and December 31, 2023, respectively. The unamortized capitalized sales commission included in deposits and other assets was $126 thousand and $153 thousand as of March 31, 2024 and December 31, 2023, respectively.