Stock Incentive Plan Compensation (Allocation of Stock-Based Compensation Expense) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense		$ 483,000	$ 1,936,000
Employee Severance [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	[1]	4,000	1,161,000
Research and development expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense		122,000	143,000
General and administrative expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense		$ 357,000	$ 632,000

[1] (1)The severance charge component of stock incentive plan compensation relates to accelerated vesting of stock options held by the Company's former Chief Executive Officer and a former executive per the terms of their employment agreements.