Quarterly report pursuant to Section 13 or 15(d)

Capitalization and Equity Structure (Details Textual)

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Capitalization and Equity Structure (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 9 Months Ended
Aug. 31, 2017
Apr. 30, 2017
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Class of Stock [Line Items]            
Payments of Stock Issuance Costs       $ 0 $ 173  
Stockholders' Equity, Reverse Stock Split       1-for-7 reverse    
Common Stock, Par or Stated Value Per Share       $ 0.001   $ 0.001
Class Of Warrant Or Right Issued       2,066    
Stock Issued During Period, Value, New Issues $ 34,000          
Shares Issued, Price Per Share $ 1.00          
Issuance of Stock and Warrants for Services or Claims $ 131          
Class of Warrant or Right, Outstanding       3,426   3,597
Shares Subscription, Description 1.1608          
Warrant Repurchase Agreement [Member]            
Class of Stock [Line Items]            
Repurchase Price Per Share $ 1.23          
Number Of Warrant Shares Repurchased 1,866          
Payments for Repurchase of Warrants $ 2,245          
Class of Warrant or Right, Outstanding       0    
Maximum [Member]            
Class of Stock [Line Items]            
Common Stock,Outstanding,Percentage 40.00%          
Rights Offering [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, New Issues 13,465     13,465    
Payments of Stock Issuance Costs $ 286          
Proceeds from Issuance of Common Stock 13,179     $ 13,179    
Stock Issued During Period, Value, New Issues $ 13,465          
Backstop Investor Offering [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, New Issues 20,535          
Stock Issued During Period, Value, New Issues $ 20,535          
2017 Warrants            
Class of Stock [Line Items]            
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 4.10   $ 4.1    
Class Of Warrant Or Right Issued   1,866   1,866    
Class of Warrant or Right, Outstanding       0   0
2015 Warrants            
Class of Stock [Line Items]            
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 3.74 $ 3.74    
Class Of Warrant Or Right Issued     2,122 0    
Class of Warrant or Right, Outstanding       1,634   1,634
Information Agent Warrants [Member]            
Class of Stock [Line Items]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       200    
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 1.50    
Class Of Warrant Or Right Issued       200    
Class of Warrant or Right, Outstanding       200   0
Warrant [Member]            
Class of Stock [Line Items]            
Payments of Stock Issuance Costs   $ 185        
Common Stock [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, New Issues   3,732        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   1,866        
Proceeds from Issuance of Common Stock   $ 10,919        
Common Stock, Par or Stated Value Per Share   $ 0.001