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Stock-Based Compensation (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-Based Compensation (Textual)          
Share-based compensation expense   $ 255,000 $ 1,075,000 $ 1,729,000  
Weighted average grant date fair value   $ 0.67 $ 1.24 $ 3.14  
Options granted to purchase of common stock to employee     90,000 10,000  
Options granted to purchase of common stock to board members   25,000 515,000 395,200  
Stock based compensation options granted to purchase of common stock to employee fair value   $ 17,000 $ 800,000 $ 1,300,000  
Exercise price of the warrants   $ 1.12      
Proceeds from exercise of warrants   36,000  
Term of stock options description   Options granted under the Director Plan vest over a one to four-year period, expire five to seven years after the date of grant and have exercise prices reflecting market value of the shares of our common stock on the date of grant. Stock options granted under the 2006 and 2015 Plans are exercisable over a maximum term of ten years from the date of grant, vest in various installments over a one to four-year period and have exercise prices reflecting the market value of the shares of common stock on the date of grant.      
Private Placement [Member]          
Stock-Based Compensation (Textual)          
Exercise price of the warrants $ 0.99        
Swedish employees [Member]          
Stock-Based Compensation (Textual)          
Number of shares, options granted     265,000    
Stock Options [Member]          
Stock-Based Compensation (Textual)          
Share-based compensation expense   $ 300,000 $ 1,100,000 $ 1,700,000  
Weighted average grant date fair value   $ 4.43      
Vesting period   1 year 1 month 6 days      
Number of options outstanding   1,846,000 2,184,117 1,709,400 1,600,583
Number of shares, options granted   25,000 605,000 405,200  
2015 Plan [Member] | Stock Options [Member]          
Stock-Based Compensation (Textual)          
Number of shares, options granted   25,000      
Aggregate shares of common stock, shares     2,100,000    
Warrant [Member]          
Stock-Based Compensation (Textual)          
Vesting period   1 year 1 month 6 days      
Common stock issuable upon exercise of warrants   11,565   10,053  
Number of options outstanding   7,913,676 464,073 3,335,073 828,573
Number of shares, options granted   3,600,000