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Revenue, Deferred Revenue and Prepaid Commissions
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
REVENUE, DEFERRED REVENUE AND PREPAID COMMISSIONS REVENUE, DEFERRED REVENUE AND PREPAID COMMISSIONS
Revenue Recognition
Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.
The following table presents our revenues disaggregated by revenue type:
For the Year Ended December 31,
(Dollars in thousands)202220212020
Revenue:
Paging revenue$73,323 $75,845 $79,916 
Product and other revenue2,299 2,981 3,677 
Wireless revenue$75,622 $78,826 $83,593 
License$7,202 $5,917 $5,245 
Professional services12,565 17,161 17,910 
Hardware2,211 2,267 2,841 
Operations revenue21,978 25,345 25,996 
Maintenance36,934 37,982 38,591 
Software revenue$58,912 $63,327 $64,587 
Total revenue$134,534 $142,153 $148,180 
The Company is currently structured as a single operating (and reportable) segment, a clinical communication and collaboration business. The U.S. was the only country that accounted for more than 10% of the Company’s total revenue for the years ended December 31, 2022, 2021 and 2020. Revenue generated in the U.S. and internationally consisted of the following for the periods stated:
 For the Year Ended December 31,
(Dollars in thousands)202220212020
Revenue:
United States$130,380 $138,265 $145,349 
International4,154 3,888 2,831 
Total revenue$134,534 $142,153 $148,180 
Deferred Revenues
Our deferred revenues represent payments made to, or due from, customers in advance of our performance. Changes in the balance of total deferred revenue during the twelve months ended December 31, 2022, are as follows:
(Dollars in thousands)December 31, 2021AdditionsRevenue RecognizedDecember 31, 2022
Deferred Revenue$26,406 $58,536 $(58,418)$26,524 
During the twelve months ended December 31, 2022, the Company recognized $22.8 million of revenue related to amounts deferred as of December 31, 2021.
Prepaid Commissions
Our prepaid commissions represent payments made to employees in advance of our performance on the related underlying contracts. These costs have been incurred directly in relation to obtaining a contract. As such, these costs are amortized over the estimated period of benefit. Changes in the balance of total prepaid commissions during the year ended December 31, 2022, are as follows:
(Dollars in thousands)December 31, 2021AdditionsCommissions RecognizedDecember 31, 2022
Prepaid Commissions$1,821 $3,957 $(4,033)$1,745 
Prepaid commissions are included within prepaid expenses in the Consolidated Balance Sheets and commissions expense is included within Selling and marketing on the Consolidated Statements of Operations.
Remaining Performance Obligations
The balance of consideration allocated to remaining performance obligations at December 31, 2022 was $44.0 million. We expect to recognize approximately $33.1 million of these remaining performance obligations over the next 12 months, with the remaining balance recognized thereafter.