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Related Party Transactions - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Nov. 30, 2006
Related party transactions        
Director fees expenses $ 23,000 $ 57,000    
The entity whose independent board member serves the company's board of directors | Alliance Agreement        
Related party transactions        
Number of common stock owned by related party     0  
Election effective date   May 24, 2017    
Accounts receivable 0 $ 0 $ 0  
Deferred revenue balance $ 0 $ 0 $ 0  
The entity whose independent board member serves the company's board of directors | Minimum | Alliance Agreement        
Related party transactions        
Percentage of beneficial ownership interest of the entity's common stock       5.00%
The entity whose vice chairman of the board of directors is a director of the company and is also a managing member of a significant shareholder of the company        
Related party transactions        
Percentage of beneficial ownership interest of the entity's common stock 29.70% 29.70%