Segment Information (Tables)
12 Months Ended
Dec. 31, 2012
Segment Information [Abstract]  
Revenues And Operating Income By Reportable Segment
    For the years ended December 31,
  (in thousands) 2012 2011 2010
 
Revenues:              
M2M Services   $ 65,293 $ 57,212 $ 56,710
Other Services     1,447   1,148   1,533
    $ 66,740 $ 58,360 $ 58,243
 
Gross profit:              
M2M Services   $ 28,030 $ 25,789 $ 24,873
Other Services     772   413   784
    $ 28,802 $ 26,202 $ 25,657
Identifiable Assets
  December 31,
Identifiable Assets 2012 2011
M2M Services $ 58,460 $ 47,985
Other Services   2,120   1,779
Unallocated Corporate   11,567   11,664
  $ 72,147 $ 61,428
Revenue Generated From Customers Based Outside Of The U.S.
  For the yeard ended December 31,
  2012   2011   2010  
U.S. 88 % 90 % 92 %
Canada 10   5   6  
Others 2   5   2  
  100 % 100 % 100 %