Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Allocated Stock-based Compensation Expense

The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of comprehensive loss for the three and nine months ended September 30, 2015 and 2014, respectively (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Research and development	$	83	$	92	$	253	$	438
General and administrative	492		990		1,081		3,440
Total stock-based compensation from continuing operations	$	575	$	1,082	$	1,334	$	3,878
Stock based compensation from discontinued operations	$	275	$	217	$	788	$	557

Assumptions for Option Grants Issued

The company uses the Black-Scholes option-pricing model and the following weighted-average assumptions to determine the fair value of all its stock options granted:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Risk free interest rate	—	%	2.02	%	1.50	%	2.02	%
Volatility	—	%	79.10	%	74.20	%	79.47	%
Expected lives (years)	0.00		6.12		6.09		6.15
Expected dividend yield	—	%	—	%	—	%	—	%

Stock Option Activity

The following table summarizes option activity of the company:



	Total Number of Shares (In Thousands)		Weighted Average Exercise Price		Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2015	8,590		$	3.25
Granted	3,682		1.73
Exercised	(39	)	0.79		$	37
Cancelled	(1,045	)	2.44		$	21
Outstanding at September 30, 2015	11,188		$	2.83	$	690
Options exercisable at September 30, 2015	6,622		$	3.32	$	618