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Subsequent Event (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2018
Dec. 31, 2017
Subsequent Event [Member] | Underwriting Agreement [Member]    
Subsequent Event [Line Items]    
Shares issued 14,375,000  
Price per share $ 2.40  
Commissions 4.00%  
Proceeds from issuance of common stock from offering, net of issuance costs $ 32.8  
Notes [Member]    
Subsequent Event [Line Items]    
Holders may elect to receive net proceeds from financing activities, percentage   25.00%