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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Measurements [Abstract]  
Assets and Liabilities Measured at Fair Value
The following table provides a summary of the recognized assets and liabilities that we measure at fair value on a recurring basis as of December 31, 2014:

  
Balance as of
  
Basis of Fair Value Measurements
 
  
December 31, 2014
  
Level 1
  
Level 2
  
Level 3
 
Assets:
            
Cash equivalents
 
$
8,144,000
  
$
8,144,000
  
$
—
  
$
—
 
                 
Liabilities:
                
Warrant liability
 
$
9,793,000
  
$
—
  
$
—
  
$
9,793,000
 
Summary of change in Level 3 warrant liability
The following table summarizes the change in our Level 3 warrant liability value:

Warrant liability
 
December 31, 2015
  
December 31, 2014
 
       
Beginning balance
 
$
9,793,000
  
$
—
 
Additions to warrant liability
  
15,979,000
   
10,162,000
 
Exercised warrants
  
(18,104,000
)
  
—
 
Change in fair value
  
(7,668,000
)
  
(369,000
)
Ending balance
 
$
—
  
$
9,793,000