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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
3 Months Ended
Mar. 31, 2015
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Liabilities measured at fair value on recurring basis
Liabilities measured at fair value on a recurring basis are summarized as follows:

  
Fair value measurement using inputs
 
Carrying amount
 
  
Level 1
 
Level 2
 
Level 3
 
March 31,
2015
 
December 31,
2014
 
           
Financial instruments:
          
Derivative warrant liability
  $
   $
  
$
1,860
  
$
1,860
   $
 
Activity for financial instruments at fair value using Level 3 inputs
The following table summarizes the activity for financial instruments at fair value using Level 3 inputs:

Balance at December 31, 2014
 
$
 
Issuance of warrants
  
1,590
 
Change in fair value recorded in earnings
  
270
 
Balance at March 31, 2015
 
$
1,860