Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

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 March 31, 2015 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)	Level I		Level II		Level III			Total
Cash equivalents	$	27,429	$	—	$	—		$	27,429
Short-term investments		37,102		—		—			37,102
Warrant liability		—		—		(7,002	)		(7,002	)

The following table summarizes fair value measurements by level at December 31, 2014 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)	Level I		Level II		Level III			Total
Cash equivalents	$	31,159	$	—	$	—		$	31,159
Short-term investments		45,622		—		—			45,622
Warrant liability		—		—		(5,131	)		(5,131	)