Earnings/(Loss) per Common Share (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average number of antidilutive potential common shares excluded from computation (in shares)	16,096,257	43,168,895
Series B Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average number of antidilutive potential common shares excluded from computation (in shares)	8,494,733	33,240,261
Common share warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average number of antidilutive potential common shares excluded from computation (in shares)	1,642,409	3,145,575
Employee stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average number of antidilutive potential common shares excluded from computation (in shares)	5,347,188	6,217,966
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average number of antidilutive potential common shares excluded from computation (in shares)	611,927	565,093