Stock Options (Tables) (Stock Options [Member])

6 Months Ended

Jun. 30, 2014

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of options granted, exercised, expired and forfeited

A summary of stock options granted, exercised, expired and forfeited under our stock incentive plans and stock options outstanding as of, and changes made during, the six months ended June 30, 2014, is presented below (shares in thousands):

	Outstanding				Exercisable
	Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options	Weighted Average Exercise Price
Options outstanding, December 31, 2013	1,792		$	2.21	410	$	2.71
Granted	—		—
Exercised	(50	)	0.90
Expired	—		—
Forfeited and canceled	(248	)	2.75
Options outstanding, June 30, 2014	1,494		$	2.16	750	$	2.35

Weighted average grant date fair value of options

The weighted average fair value of each option granted is estimated on the date of grant using the Black-Scholes option valuation model with the following weighted average assumptions during the six and three months ended June 30, 2013:

	Six Months Ended	Three Months Ended
	June 30,	June 30,
	2013	2013
Risk free interest rate	0.8%	1.1%
Expected option lives	5 years	5 years
Expected volatility	103.2%	101.3%
Estimated forfeiture rate	10%	10%
Expected dividend yields	—	—
Weighted average grant date fair value of options	$1.39	$0.67

Stock option compensation expense is allocated

Stock option compensation expense is allocated as follows for the six and three months ended June 30, 2014 and 2013 (in thousands):

	Six Months Ended				Three Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
General and administrative	151		357		10		147
	$	151	$	357	$	10	$	147