Stock-Based Compensation - Schedule of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock Options
Exercised (in shares)		(722)
Stock Options
Stock Options
Outstanding, Beginning Balance (in shares)	286,707	455,122
Granted (in shares)	0	(4,500)
Exercised (in shares)	0	(722)
Canceled (in shares)	(71,400)	(116,843)
Forfeited (in shares)	(25,841)	(46,350)
Outstanding, Ending Balance (in shares)	189,466	286,707	455,122
Exercisable as of December 31, 2017 (in shares)	183,466
Weighted Average Exercise Price
Oustanding, Beginning Balance (in dollars per share)	$ 77.51	$ 90.22
Granted (in dollars per share)	0.00	8.30
Exercised (in dollars per share)	0.00	14.00
Canceled (in dollars per share)	80.23	158.77
Forfeited (in dollars per share)	16.42	14.93
Outstanding, Ending Balance (in dollars per share)	84.81	$ 77.51	$ 90.22
Exercisable as of December 31, 2017 (in dollars per share)	$ 87.12
Weighted Average Remaining Contractual Life, Outstanding (Years)	1 year 9 months 18 days	3 years 9 months 18 days	4 years 4 months 24 days
Weighted Average Remaining Contractual Life, Exercisable (Years)	1 year 7 months 2 days