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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amounts of Goodwill by Segment

The changes in the carrying amounts of goodwill by segment from December 31, 2014 to March 31, 2015 were as follows:

 

    Energy & Security Sonar Solutions segment     GridSense segment     Total  
Balance at December 31, 2014   $ 518     $ 513     $ 1,031  
Translation adjustment     (12 )     —       (12 )
Balance at March 31, 2015   $ 506     $ 513     $ 1,019  
Changes in Carrying Amounts and Accumulated Amortization of Intangible Assets

The changes in the carrying amounts and accumulated amortization of intangible assets from December 31, 2014 to March 31, 2015 were as follows:

  

    Cost     Accumulated amortization     Total  
Balance as of December 31, 2014   $ 2,175     $ (964 )   $ 1,211  
Amortization     —       (47 )     (47 )
Cumulative translation adjustment     (74 )     37       (37 )
Balance as of March 31, 2015   $ 2,101     $ (974 )   $ 1,127