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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2012
Fair Value Measurements [Abstract]  
Fair value measurements by level for assets and liabilities measured at fair value on a recurring basis
The following table summarizes fair value measurements by level at June 30, 2012 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)
 
Level I
 
 
Level II
 
 
Level III
 
 
Total
 
Cash equivalents
 
$
11,045
 
 
$
-
 
 
$
-
 
 
$
11,045
 
Marketable securities
 
 
15,068
 
 
 
-
 
 
 
-
 
 
 
15,068
 
Warrant liability
 
 
-
 
 
 
-
 
 
 
19,155
 
 
 
19,155
 

The following table summarizes fair value measurements by level at December 31, 2011 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)
 
Level I
 
 
Level II
 
 
Level III
 
 
Total
 
Cash equivalents
 
$
17,073
 
 
$
-
 
 
$
-
 
 
$
17,073
 
Marketable securities
 
 
18,058
 
 
 
-
 
 
 
-
 
 
 
18,058
 
Warrant liability
 
 
-
 
 
 
-
 
 
 
6,739
 
 
 
6,739