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Revenue, Deferred Revenue and Deferred Commissions (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Schedule of Revenue
The following table presents our revenues disaggregated by revenue type:

 
For the Twelve Months Ended December 31,
(Dollars in thousands)
 
2018
 
2017(1)
 
2016(1)
Wireless products and services
 
$
94,277

 
$
101,188

 
$
109,590

License
 
13,042

 
9,541

 
8,832

Professional services
 
18,091

 
17,630

 
18,594

Equipment
 
4,995

 
4,147

 
5,472

Maintenance
 
39,069

 
38,669

 
37,073

Total revenue
 
$
169,474

 
$
171,175

 
$
179,561

(1) Prior period amounts have not been adjusted under the modified retrospective method for the adoption of ASC 606.
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, 2018, 2017 and 2016. Revenue generated in the U.S. and internationally consisted of the following for the periods stated:
 
For the Twelve Months Ended December 31,
(Dollars in thousands)
2018
 
2017(1)
 
2016(1)
Revenue
 
 
 
 
 
United States
$
164,558

 
$
166,790

 
$
173,852

International
4,916

 
4,385

 
5,709

Total revenue
$
169,474

 
$
171,175

 
$
179,561

(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 twelve months ended December 31, 2018 are as follows:
(Dollars in thousands)
December 31, 2017(2)
 
Additions
 
Revenue Recognized(1)
 
December 31, 2018
Deferred Revenue
$
29,920

 
$
67,914

 
$
(71,073
)
 
$
26,761

(1)Includes $4.6 million which went to retained earnings and was not recognized as revenue resulting from the adoption of ASC 606.
(2)Includes a $2.6 million adjustment to deferred revenue. Refer to Note 1, "Organization and Significant Accounting Policies", for additional details.
Schedule of Deferred Commissions
Changes in the balance of total deferred commissions during the twelve months ended December 31, 2018 are as follows:
(Dollars in thousands)
December 31, 2017
 
Additions(1)
 
Commissions Recognized
 
December 31, 2018
Deferred Commissions
$
1,676

 
$
(5,434
)
 
$
6,152

 
$
2,394

(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.