PREPAID EXPENSES AND OTHER ASSETS (Tables)
12 Months Ended
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of components of prepaid expenses and other current assets
   
As of December 31,
 
   
2013
   
2012
 
Prepaid expenses
    1,223       531  
Deferred costs
    488       772  
Other
    122       161  
    $ 1,833     $ 1,464  
Schedule of components of other noncurrent assets
   
As of December 31,
 
   
2013
   
2012
 
Prepaid carrier fees
  $ 1,658     $ 1,879  
Cost method investments
    200       522  
Deposits
    168       186  
Other
    272       102  
    $ 2,298     $ 2,689