Loss per Common Share - Narrative (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Warrants outstanding (in shares)	3,040,540
Number of securities called by warrants	152,027	152,027	152,027
Minimum price per share to exercise for first half of warrants (in dollars per share)	$ 556.4
Term of warrants	7 years
Stock Compensation Plan
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,716,928	1,413,461	39,231
Employee Stock Option
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,301,046	1,942,909	68,867