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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2012
Summary of Significant Accounting Policies [Abstract]  
Fair Value, Assets
The following tables show our securities' adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category  as of March 31, 2012 and December 31, 2011.
                                                                                                
   March 31, 2012 
Level 1:
 
 
Adjusted Cost
 
 
Unrealized Gains
 
 
Unrealized Losses
 
 
Fair Value
 
Certificates of deposit
 
 
$
3,332
 
 
$
3
 
 
$
-
 
 
$
3,335
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate Bonds:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
AA
 
 
 
4,185
 
 
 
13
 
 
 
-
 
 
 
4,198
 
    A 
 
 
7,261
 
 
 
-
 
 
 
(7
)
 
 
7,254
 
BAA
 
 
 
5,179
 
 
 
-
 
 
 
(31
)
 
 
5,148
 
Total Corporate Bonds
 
 
 
16,625
 
 
 
13
 
 
 
(38
)
 
 
16,600
 
                  
Total Investments at Fair Value
 
 
$
19,957
 
 
$
16
 
 
$
(38
)
 
$
19,935
 
 
   December 31, 2011 
Level 1:
 
 
Adjusted Cost
 
 
Unrealized Gains
 
 
Unrealized Losses
 
 
Fair Value
 
Certificates of deposit
 
 
$
2,582
 
 
$
2
 
 
$
-
 
 
$
2,584
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate Bonds:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
AA
 
 
 
2,014
 
 
 
-
 
 
 
(3
)
 
 
2,011
 
       A 
 
 
9,846
 
 
 
-
 
 
 
(3
)
 
 
9,843
 
Total Corporate Bonds
 
 
 
11,860
 
 
 
-
 
 
 
(6
)
 
 
11,854
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Investments at Fair Value
 
 
$
14,442
 
 
$
2
 
 
$
(6
)
 
$
14,438
 
Fair Value, Liabilities
The following tables set forth by level within the fair value hierarchy, our financial instrument liabilities as of March 31, 2012 and December 31, 2011.
 
  March 31, 2012 
 
 
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
 
$
-
 
 
$
-
 
 
$
4,430
 
 
$
4,430
 
Total
 
$
-
 
 
$
-
 
 
$
4,430
 
 
$
4,430
 
 
  
December 31, 2011
 
 
 
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
 
$
-
 
 
$
-
 
 
$
4,699
 
 
$
4,699
 
Total
 
$
-
 
 
$
-
 
 
$
4,699
 
 
$
4,699
 
Level 3 Financial liability [Roll Forward]
The following table sets forth a summary of changes in the fair value of our Level 3 financial instrument liability for the period ended March 31, 2012 and year ended December 31, 2011:
                                                                                                                    
  March 31, 2012   December 31, 2011 
  
Fair Value
Measurements
Using
Significant
Unobservable
Inputs (Level3)
   
Fair Value
Measurements
Using
Significant
Unobservable
Inputs (Level3)
 
Balance December 31, 2011
 $4,699 
Balance December 31, 2010
 $14,364 
Net gain included in loss
  (269 )
Net loss included in earnings
  5,595 
Settlements
  - 
Settlements
  (15,260)
Balance March 31, 2012
 $4,430 
Balance December 31, 2011
 $4,699