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Intangible assets (Tables)
 3 Months Ended
Mar. 31, 2018
Intangible assets  
Schedule of finite-lived intangible assets

 

 

 

 

 

 

 

 

    

March 31, 

    

December 31, 

 

 

2018

 

2017

 

 

in thousands

Licenses

 

$

6,288

 

$

9,551

Less accumulated amortization and impairment

 

 

(2,153)

 

 

(5,575)

Licenses, net

 

$

4,135

 

$

3,976