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Revenue
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following table depicts the disaggregation of revenue by geographic region based on the shipping address of customers (in thousands):
Year Ended December 31,
202120202019
United States$150,579 $119,897 $70,124 
EMEA36,788 26,197 13,645 
Other16,246 10,847 5,364 
Total revenue$203,613 $156,941 $89,133 
The following table summarizes the foreign countries which contributed 10% or more of the total revenue (in thousands):
Year Ended December 31,
202120202019
United Kingdom10 %*10 %
*Represent less than 10% of total revenue
No single customer accounted for 10% or more of the total revenue during 2021, 2020 and 2019. Additionally, no single customer accounted for 10% or more of accounts receivable as of December 31, 2021 and 2020.
The following table summarizes revenue by digital engagement platform and Legacy offering (in thousands):
Year Ended December 31,
202120202019
Digital engagement platform - subscription and other platform$175,777 $121,214 $66,286 
Digital engagement platform - professional services27,702 33,583 14,413 
Legacy - subscription and other platform99 1,416 6,303 
Legacy - professional services35 728 2,131 
Total revenue$203,613 $156,941 $89,133 
Contract Balances
Accounts receivable: The Company records accounts receivable when the Company has a contractual right to consideration. In some arrangements, a right to consideration for the Company’s performance under the customer contract may occur before invoicing to the customer, resulting in an unbilled receivable. As of December 31, 2021 and 2020, unbilled receivables were included within accounts receivable, net of allowance for doubtful accounts and billing reserves on the consolidated balance sheets and were not material.
Contract assets: The Company records a contract asset when the Company has satisfied a performance obligation but does not yet have an unconditional right to consideration. Contract assets are included in prepaid expenses and other current assets in the consolidated balance sheets and were not material as of December 31, 2021 and 2020.
Contract liabilities: The Company defers its revenue when the Company has the right to invoice in advance of performance under a customer contract. The current portion of deferred revenue balances is recognized during the following 12-month period and the remaining portion is recorded as noncurrent, which is included in other long-term liabilities on the consolidated balance sheet. The amount of revenue recognized in 2021 that was included in deferred revenue at the beginning of the period was $87.9 million.
Remaining Performance Obligations
The terms of the Company’s subscription agreements are primarily annual and, to a lesser extent, multi-year. The Company may bill for the full term in advance or on an annual, quarterly or monthly basis, depending on the terms of the agreement. As of December 31, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was $154.2 million, which consists of both billed consideration in the amount of $97.2 million and unbilled consideration in the amount of $57.0 million that the Company expects to recognize as revenue. As of December 31, 2021, the Company expects to recognize 79% of its remaining performance obligations as revenue over the subsequent 12 months and the remainder thereafter.