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Share-based Compensation (Warrants Outstanding) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation [Abstract]    
Warrants, beginning balance 1,328,452 710,801
Warrants, granted 13,394,338 617,651
Warrants, exercised (22,800)  
Warrants, forfeited  
Warrants, ending balance 14,699,990 1,328,452
Weighted average exercise price, beginning balance $ 29.70 $ 46.64
Weighted average exercise price, granted 3.58 10.20
Weighted average exercise price, exercised 3.35  
Weighted average exercise price, forfeited  
Weighted average exercise price, ending balance $ 5.94 $ 29.70