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Revenue, Deferred Revenue and Prepaid Commissions (Tables)
12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Revenue
The following table presents our revenues disaggregated by revenue type:
For the Year Ended December 31,
(Dollars in thousands)202120202019
Revenue:
Paging revenue$75,845 $79,916 $85,067 
Product and other revenue2,981 3,677 3,100 
Wireless revenue$78,826 $83,593 $88,167 
License$5,494 $5,179 $8,950 
Professional services17,161 17,910 19,189 
Hardware2,267 2,841 3,618 
Subscription423 66 — 
Operations revenue25,345 25,996 31,757 
Maintenance37,982 38,591 40,365 
Software revenue$63,327 $64,587 $72,122 
Total revenue$142,153 $148,180 $160,289 
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, 2021, 2020 and 2019. 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)202120202019
Revenue:
United States$138,265 $145,349 $154,766 
International3,888 2,831 5,523 
Total revenue$142,153 $148,180 $160,289 
Schedule of Deferred Revenue Changes in the balance of total deferred revenue during the twelve months ended December 31, 2021, are as follows:
(Dollars in thousands)December 31, 2020AdditionsRevenue RecognizedDecember 31, 2021
Deferred Revenue$29,796 $59,165 $(62,555)$26,406 
Schedule of Deferred Commissions Changes in the balance of total prepaid commissions during the year ended December 31, 2021, are as follows:
(Dollars in thousands)December 31, 2020AdditionsCommissions RecognizedDecember 31, 2021
Prepaid Commissions$2,290 $3,957 $(4,426)$1,821