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Stock-Based Compensation - Warrants Granted to Non-Employees - General Information (Details) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Warrant information    
Proceeds from exercise of stock warrants   $ 42,000
Stock warrants    
Warrant information    
Stock warrants exercised (in shares) 0  
Proceeds from exercise of stock warrants $ 0  
Stock warrants | Non-Employee    
Warrant information    
Stock warrants vested ( in shares) 305,775  
Stock warrants outstanding (in shares) 305,775  
Warrants, exercise price (in dollars per share) $ 2.57