Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Stock-Based Compensation [Abstract]
Shares, Balance at December 31, 2016	74,890
Shares, Granted	1,070,572
Shares, Exercises
Shares, Forfeited	(28,697)
Shares, Balance at September 30, 2017	1,116,765	74,890
Shares, Exercisable at September 30, 2017	131,928
Weighted Average Exercise Price, Outstanding at December 31, 2016	$ 64.50
Weighted Average Exercise Price, Granted	1.22
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited	89.66
Weighted Average Exercise Price, Outstanding at September 30, 2017	3.19	$ 64.50
Weighted Average Exercise Price, Exercisable at September 30, 2017	$ 12.89
Average Remaining Contractual Term (Years), Outstanding at December 31, 2016		8 years 7 months 24 days
Average Remaining Contractual Term (Years), Outstanding at September 30, 2017	9 years 2 months 23 days
Average Remaining Contractual Term (Years), Exercisable at September 30, 2017	4 years 1 month 16 days
Intrinsic Value, Outstanding at September 30, 2017	$ 24,000
Intrinsic Value, Exercisable at September 30, 2017	$ 9,000