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Revenue, Deferred Revenue And Deferred Commissions (Tables)
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Schedule of Revenue
Revenue by geographic region consisted of the following for the periods stated:
 
For the Three months ended September 30, 2018
 
For the Nine Months Ended September 30,
(Dollars in thousands)
2018
 
2017(1)
 
2018
 
2017(1)
Revenue
 
 
 
 
 
 
 
United States
$
41,198

 
$
42,448

 
$
122,243

 
$
123,822

International
1,278

 
1,188

 
3,975

 
3,583

Total revenue
$
42,476

 
$
43,636

 
$
126,218

 
$
127,405

(1) Prior period amounts have not been adjusted under the modified retrospective method for the adoption of ASC 606.
The following table presents our revenues disaggregated by revenue type:
 
For the Three months ended September 30, 2018
 
For the Nine Months Ended September 30,
(Dollars in thousands)
2018
 
2017(1)
 
2018
 
2017(1)
Wireless products and services
$
23,259

 
$
25,110

 
$
71,186

 
$
76,609

Subscription
1,779

 
577

 
2,640

 
1,744

Software licenses
1,396

 
1,995

 
6,904

 
4,807

Professional services
4,555

 
5,189

 
12,988

 
12,192

Hardware
1,296

 
1,102

 
3,428

 
3,202

Maintenance
10,191

 
9,663

 
29,072

 
28,851

Total revenue
$
42,476

 
$
43,636

 
$
126,218

 
$
127,405

(1) Prior period amounts have not been adjusted under the modified retrospective method for the adoption of ASC 606.
Schedule of Deferred Revenue
Changes in the balance of total deferred revenue during the nine months ended September 30, 2018 are as follows:
(Dollars in thousands)
December 31, 2017
 
Additions
 
Revenue Recognized(1)
 
September 30, 2018
Deferred Revenue
$
32,477

 
$
48,273

 
$
(47,746
)
 
$
33,004

(1)Includes $4.6 million which went to retained earnings and was not recognized as revenue resulting from the adoption of ASC 606.
Schedule of Deferred Commissions
Changes in the balance of total deferred commissions during the nine months ended September 30, 2018 are as follows:
(Dollars in thousands)
December 31, 2017
 
Additions(1)
 
Commissions Recognized
 
September 30, 2018
Deferred Commissions
$
1,676

 
$
4,894

 
$
(4,393
)
 
$
2,177

(1)Includes $0.7 million in previously recognized commissions expense which was removed from retained earnings and included in deferred commissions resulting from the adoption of ASC 606.