Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Stock-Based Compensation [Abstract]
Shares, Balance at December 31, 2016	74,890
Shares, Granted	239,083
Shares, Exercises
Shares, Forfeited	(28,697)
Shares, Balance at June 30, 2017	285,276	74,890
Shares, Exercisable at June 30, 2017	78,522
Weighted Average Exercise Price, Outstanding at December 31, 2016	$ 64.50
Weighted Average Exercise Price, Granted	2.29
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited	89.66
Weighted Average Exercise Price, Outstanding at June 30, 2017	9.83	$ 64.50
Weighted Average Exercise Price, Exercisable at June 30, 2017	$ 20.12
Average Remaining Contractual Term (Years), Outstanding at December 31, 2016		8 years 7 months 24 days
Average Remaining Contractual Term (Years), Outstanding at June 30, 2017	7 years 2 months 12 days
Average Remaining Contractual Term (Years), Exercisable at June 30, 2017	4 years 11 months 15 days
Intrinsic Value, Outstanding at June 30, 2017	$ 5,932
Intrinsic Value, Exercisable at June 30, 2017	$ 0