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Revenues (Tables)
 3 Months Ended
Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]  
Schedule of Revenue
The following table presents our revenues disaggregated by revenue type:
 
For the Three Months Ended March 31,
(Dollars in thousands)
2018
 
2017(1)
Wireless products and services
$
24,269

 
$
25,860

Subscription
420

 
543

Software licenses
3,956

 
1,171

Professional services
4,071

 
3,354

Hardware
1,024

 
973

Maintenance
9,374

 
9,543

Total revenue
$
43,114

 
$
41,444

(1) Prior period amounts have not been adjusted under the modified retrospective method for the adoption of ASC 606.
Revenue by Geographic Areas
Revenue by geographic region consisted of the following for the periods stated:
 
For the Three Months Ended March 31,
(Dollars in thousands)
2018
 
2017(1)
Revenue
 
 
 
United States
$
41,935

 
$
40,506

International
1,179

 
938

Total revenue
$
43,114

 
$
41,444

(1) Prior period amounts have not been adjusted under the modified retrospective method for the adoption of ASC 606.