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 6 Months Ended
Apr. 30, 2017
Dec. 31, 2015
Jun. 30, 2017
Jun. 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     1,866    
2017 Warrants          
Class of Stock [Line Items]          
Class Of Warrant Or Right Issued 1,866   1,866    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 4.10   $ 4.10    
Class of Warrant or Right, Expiration Term 5 years        
2015 Warrants          
Class of Stock [Line Items]          
Class Of Warrant Or Right Issued   2,122 0    
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 3.74 $ 3.74    
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 $ 10,900        
Common Stock, Par or Stated Value Per Share $ 0.001