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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2013
Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block]
The Company utilized the following assumptions to estimate the fair value of the May 10, 2009, May 18, 2009 and May 21, 2009 warrants:
 
 
December 31,
 
2013
 
2012
 
2011
Underlying price per share  
$0.19-$0.27
 
$0.25-$0.80
 
$0.20-$0.46
Exercise price per share
$1.31-$1.65
 
$1.31-$1.65
 
$1.31-$1.65
Risk-free interest rate      
0.06%-0.23%
 
0.19%-0.44%
 
0.29%-1.58%
Expected holding period   
0.38-1.64 years
 
1.38-2.63 years
 
2.38-3.63 years
Expected volatility
69.74%-113.56%
 
69.21%-110.27%
 
74.55%-120.55%
Expected dividend yield
None
 
None
 
None
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The table below presents the balances of assets and liabilities measured at fair value on a recurring basis by level within the hierarchy as:
 
 
(in thousands)
As of December 31, 2013
 
Total

 
Level 1

 
Level 2

 
Level 3

Assets
 

 
 

 
 

 
 

Marketable Securities
$
17,391

 
$
17,391

 
$
—

 
$
—

Liabilities
 

 
 

 
 

 
 

Warrants
(14
)
 
—

 
—

 
(14
)
Total
$
17,377

 
$
17,391

 
$
—

 
$
(14
)
 
 
As of December 31, 2012
 
Total

 
Level 1

 
Level 2

 
Level 3

Assets
 

 
 

 
 

 
 

Marketable Securities
$
27,241

 
$
27,241

 
$
—

 
$
—

Marketable Securities - restricted
14,500

 
13,499

 
1,001

 
—

Liabilities
 

 
 

 
 

 
 

Warrants
(295
)
 
—

 
—

 
(295
)
Total
$
41,446

 
$
40,740

 
$
1,001

 
$
(295
)
 
Fair Value, Inputs, Level 3
  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
The changes in Level 3 Liabilities measured at fair value on a recurring basis are summarized as follows:
 
 
2013
 
2012
 
2011
Balance at January 1
$
295

 
$
380

 
$
2,805

Fair value adjustment at March 31
(89
)
 
151

 
(301
)
Balance March 31
206

 
531

 
2,504

Fair value adjustment at June 30
(102
)
 
(387
)
 
(643
)
Balance at June 30,
104

 
144

 
1,861

Fair value adjustment at September 30
(38
)
 
1,968

 
(614
)
Balance at September 30
66

 
2,112

 
1,247

Fair value adjustment at December 31
(52
)
 
(1,817
)
 
(867
)
Balance at December 31
$
14

 
$
295

 
$
380