Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Options
Options outstanding at beginning of period (in shares)	3,375,909
Granted (in shares)	0	3,300,000
Canceled / forfeited (in shares)	(234)
Expired (in shares)	(1,634)
Options outstanding at end of period (in shares)	3,374,041		3,375,909
Options exercisable at end of period (in shares)	74,041
Weighted- average exercise price
Options outstanding at beginning of period ( in dollars per share)	$ 5.44
Granted (in dollars per share)	0.00
Canceled / forfeited (in dollars per share)	78.08
Expired (in dollars per share)	151.20
Options outstanding at end of period (in dollars per share)	5.34		$ 5.44
Options exercisable at end of period (in dollars per share)	$ 29.80
Options, Additional Disclosures
Weighted-average remaining contractual term (years), Options outstanding	8 years 9 months 30 days		8 years 11 months 29 days
Weighted-average remaining contractual term (years), Options exercisable	4 years 6 months 10 days
Aggregate intrinsic value outstanding	$ 3,038,400		$ 4,243,700
Aggregate intrinsic value exercisable	$ 2,400