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Intangible Assets (Tables)
 6 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Reconciliation of Intangible Assets

The reconciliation of intangible assets for the six months ended December 31, 2015 and for the year ended June 30, 2015 was as follows (in thousands):

 

     Six Months Ended      Year Ended  
     December 31, 2015      June 30, 2015  

Patented technologies

      

Gross carrying amount at beginning of period

    $ 39,710       $ 41,689   

Foreign currency translation adjustments

      (1,382 )       (1,979 ) 
  

 

 

     

 

 

  

Gross carrying amount at end of period

      38,328         39,710   
  

 

 

     

 

 

  

Accumulated amortization at beginning of period

      (37,785 )       (38,924 ) 

Amortization expense

      (382 )       (770 ) 

Foreign currency translation adjustments

      1,351         1,909   
  

 

 

     

 

 

  

Accumulated amortization at end of period

      (36,816 )       (37,785 ) 
  

 

 

     

 

 

  

Net book value at end of period

    $ 1,512       $ 1,925