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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2015
Summary of Significant Accounting Policies [Abstract]  
Schedule of Deferred Revenue
During 2015, activity under the August 2013 Contract Settlement was as follows:
Deferred Revenue, December 31, 2014
 
$
2,000
 
Payment received
  
2,500
 
Less: Amount amortized as revenue
  
(1,125
)
Deferred Revenue, September 30, 2015
 
$
3,375
 
Cash and Available-for-Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value by Significant Investment Category
The following tables show the adjusted cost, gross unrealized gains, gross unrealized losses and fair value of our securities by significant investment category as of September 30, 2015 and December 31, 2014.

  
September 30, 2015
 
  
Adjusted
Cost
  
Unrealized Gains
  
Unrealized Losses
  
Fair Value
  
Cash and Cash Equivalents
  
Investments Available for Sale
 
Cash
 
$
5,405
  $
-
  $
-
  $
5,405
  $
5,405
  $
-
 
                         
Level 1:
                        
Mutual funds
  
4,585
   
-
   
-
   
4,585
   
4,585
   
-
 
Corporate securities
  
353
   
-
   
-
   
353
   
-
   
353
 
U.S agency securities
  
10,444
   
4
   
-
   
10,448
   
-
   
10,448
 
   
15,382
   
4
   
-
   
15,386
   
4,585
   
10,801
 
Total
 
$
20,787
  $
4
  $
-
  $
20,791
  $
9,990
  $
10,801
 
 
  
December 31, 2014
 
  
Adjusted
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Fair
Value
  
Cash
and Cash
Equivalents
  
Investments
Available
for Sale
 
Cash
 
$
1,183
  
$
-
  
$
-
  
$
1,183
  
$
1,183
  
$
-
 
                         
Level 1:
                        
Mutual funds
  
10,139
   
-
   
-
   
10,139
   
10,139
   
-
 
Corporate securities
  
9,405
   
1
   
(3
)
  
9,403
   
1,645
   
7,758
 
U.S agency securities
  
20,504
   
2
   
(2
)
  
20,504
   
5,691
   
14,813
 
   
40,048
   
3
   
(5
)
  
40,046
   
17,475
   
22,571
 
Total
 
$
41,231
  
$
3
  
$
(5
)
 
$
41,229
  
$
18,658
  
$
22,571
 
Financial Instrument Liabilities by Level within Fair Value Hierarchy
The following tables set forth by level within the fair value hierarchy, our liabilities stated at fair value as of December 31, 2014.
 
  
December 31, 2014
 
  
Quoted
Prices in
Active
Markets
for
Identical
Assets
  
Significant
Other
Observable
Inputs
  
Significant
Unobservable
Inputs
   
  
(Level 1)
  
(Level 2)
  
(Level 3)
  
Total
 
Series l Warrants
 
$
  
$
  
$
320
  $
320
 
Total
 
$
  
$
  
$
320
  $
320
 
Summary of Changes in Fair Value of Level 3 Liabilities
The following table sets forth a summary of changes in the fair value of our Level 3 liability stated at fair value for the nine months ended September 30, 2015 and 2014.
 
  
Nine Months Ended
September 30, 2015
   
Nine Months Ended
September 30, 2014
 
  
Fair Value
Measurements
Using
Significant
Unobservable
Inputs (Level 3)
   
Fair Value
Measurements
Using
Significant
Unobservable
Inputs (Level 3)
 
Balance December 31, 2014
 
$
320
 
Balance December 31, 2013
 
$
2,564
 
Loss on derivative liability included in net loss
  
117
 
Gain on derivative liability included in net loss
  
(2,126
)
Settlements
  
(333
)
Settlements
  
(7
)
Expiration of warrants
  
(104
)
   
 
Balance September 30, 2015
 
$
 
Balance September 30, 2014
 
$
431