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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)
12 Months Ended
Dec. 31, 2014
PREPAID EXPENSES AND OTHER CURRENT ASSETS  
Schedule of components of prepaid expenses and other current assets

 

 

 
  As of December 31,  
 
  2013   2014  

Other current assets

  $   $ 253  

Initial public offering costs

        233  

Employee advances

    21     33  

Prepaid expenses

    33     8  

Prepaid development costs

    656      

Prepaid expenses and other current assets

  $ 710   $ 527