Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

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 months ended March 31, 2016 and 2015, respectively (in thousands):

	Three Months Ended March 31,
	2016		2015
Research and development	$	127	$	77
General and administrative	529		294
Total stock-based compensation from continuing operations	$	656	$	371

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 March 31,
	2016		2015
Risk free interest rate	1.41	%	1.41	%
Volatility	75.24	%	74.62	%
Expected lives (years)	6.25		6.25
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, 2016	13,262		$	2.58
Granted	105		0.84
Exercised	(40	)	0.87		$	10
Cancelled	(1,326	)	2.37		$	25
Outstanding at March 31, 2016	12,001		$	2.59	$	421
Options exercisable at March 31, 2016	7,152		$	3.19	$	366