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Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Summary of Segmented Data

    Energy& Security Sonar Solutions     GridSense     M2M     Other     Total  
Three months ended March 31, 2015                                        
Revenues from external customers   $ 2,660     $ 908     $ 553     $ 497     $ 4,618  
Intersegment revenues     —       —       —       —       —  
Segment gross profit     605       277       340       297       1,519  
Depreciation and amortization     45       57       18       11       131  
Segment net income (loss) before income taxes     (294 )     (325 )     (278 )     105       (792 )
                                         
Three months ended March 31, 2014                                        
Revenues from external customers   $ 2,515     $ 963     $ 508     $ 468     $ 4,454  
Intersegment revenues     —       —       —       —       —  
Segment gross profit (loss)     686       185       312       247       1,430  
Depreciation and amortization     71       65       17       14       167  
Segment net loss before income taxes     (208 )     (973 )     (403 )     (21 )     (1,605 )
Reconciliation of Segment Data to Consolidated Statement of Operations

Reconciliation of Segment Income (Loss) to Consolidated Net Loss Before Income Taxes

 

    Three months ended
March 31,		  
    2014     2015  
Total net loss before income taxes for reportable segments   $ (1,584 )   $ (897 )
Other operational segment net income (loss) before income taxes     (21 )     105  
Total segment net loss before income taxes     (1,605 )     (792 )
Unallocated cost of corporate headquarters*     (1,043 )     (1,033 )
Unallocated benefit (cost) of DSIT headquarters     (26 )     10  
Consolidated loss before income taxes   $ (2,674 )   $ (1,815 )

 

* Includes stock compensation expense of $310 and $208 for the three month periods ended March 31, 2014 and 2015, respectively.