Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31, 2013 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)	Level I		Level II		Level III		Total
Cash equivalents	$	10,465	$	—	$	—	$	10,465
Short-term investments		21,000		—		—		21,000
Warrant liability		—		—		6,067		6,067

The following table summarizes fair value measurements by level at December 31, 2012 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)	Level I		Level II		Level III		Total
Cash equivalents	$	13,188	$	—	$	—	$	13,188
Short-term investments		24,000		—		—		24,000
Warrant liabilities		—		—		3,972		3,972