Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Options
Options outstanding at beginning of period (in shares)	3,375,909	85,901	85,901
Granted (in shares)	14,222	3,300,000
Canceled / forfeited (in shares)	(234)	(8,011)
Exercised (in shares)	(1,449)
Expired (in shares)	(1,697)	(1,691)
Options outstanding at end of period (in shares)	3,386,751	3,376,199	3,375,909	85,901
Options exercisable at end of period (in shares)	86,751	63,212
Weighted- average exercise price
Options outstanding at beginning of period ( in dollars per share)	$ 5.44	$ 34.86	$ 34.86
Granted (in dollars per share)	3.71	4.79
Canceled / forfeited (in dollars per share)	78.08	19.52
Exercised (in dollars per share)	3.61
Expired (in dollars per share)	209.87	151.20
Options outstanding at end of period (in dollars per share)	5.33	5.45	$ 5.44	$ 34.86
Options exercisable at end of period (in dollars per share)	$ 25.78	$ 39.72
Options, Additional Disclosures
Weighted-average remaining contractual term (years), Options outstanding	8 years 3 months	9 years 2 months 15 days	8 years 11 months 29 days	5 years 8 months 15 days
Weighted-average remaining contractual term (years), grants in period	8 years 4 months 30 days	9 years 3 months 15 days
Weighted-average remaining contractual term (years), Options exercisable	4 years 8 months 1 day	4 years 5 months 15 days
Aggregate intrinsic value outstanding	$ 4,240,000	$ 2,046,000	$ 4,243,700	$ 0
Aggregate intrinsic value, grants in period	29,900	2,046,000
Aggregate intrinsic value exercisable	$ 49,000	$ 0