Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Fair Value of Assets and Liabilities [Abstract]

Assets and liabilities measured and recorded in the financial statements at fair value on a recurring basis

(In thousands)	Total		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2013
Assets
Money market fund	$	6,102	$	6,102	$	—	$	—
Total assets	$	6,102	$	6,102	$	—	$	—
Total liabilities	$	—	$	—	$	—	$	—
December 31, 2012
Assets
Money market fund	$	9,990	$	9,990	$	—	$	—
Total assets	$	9,990	$	9,990	$	—	$	—
Total liabilities	$	—	$	—	$	—	$	—

Assumptions and other inputs used to compute the fair value of the warrant liability

	March 31 2012			December 31, 2011
Common stock price	$	1.73		$	1.05
Expected warrant exercise price	$	1.63		$	1.46
Remaining term of warrant (years)		4.6			4.8
Expected volatility		61	%		58	%
Average risk free interest rate		0.9	%		0.8	%
Expected dividend yield		—			—
Expected percentage of warrants to be exercised		100	%		100	%