Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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 operations for the three months ended March 31, 2017 and 2016, respectively (in thousands):

	Three Months Ended March 31,
	2017		2016
Research and development	$	38	$	127
General and administrative	190		529
Total stock-based compensation from continuing operations	$	228	$	656

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,
	2017		2016
Risk free interest rate	2.01	%	1.41	%
Volatility	108.55	%	75.24	%
Expected lives (years)	6.13		6.25
Expected dividend yield	—	%	—	%

Stock Option Activity

The following table summarizes stock option activity of the Company for the three months ended March 31, 2017:

	Total Number of Shares (In Thousands)		Weighted Average Exercise Price		Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2017	561		$	41.50
Granted	70		1.75
Exercised	—		—		$	—
Canceled	(73	)	32.59		$	—
Outstanding at March 31, 2017	558		$	37.68	$	—
Options exercisable at March 31, 2017	356		$	52.96	$	—