Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Stock-Based Compensation [Abstract]
Shares, Balance at December 31, 2016	74,890
Shares, Granted	46,732
Shares, Exercises
Shares, Forfeited	(1,262)
Shares, Balance at March 31, 2017	120,360	74,890
Shares, Exercisable at March 31, 2017	39,766
Weighted Average Exercise Price, Outstanding at December 31, 2016	$ 64.50
Weighted Average Exercise Price, Granted	4.50
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited	28.60
Weighted Average Exercise Price, Outstanding at March 31, 2017	41.60	$ 64.50
Weighted Average Exercise Price, Exercisable at March 31, 2017	$ 78.00
Average Remaining Contractual Term (Years), Outstanding at December 31, 2016		8 years 7 months 24 days
Average Remaining Contractual Term (Years), Outstanding at March 31, 2017	8 years 11 months 12 days
Average Remaining Contractual Term (Years), Exercisable at March 31, 2017	8 years 1 month 17 days
Intrinsic Value, Exercisable at March 31, 2017	$ 0