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Common Stock - Narrative (Details) - $ / shares
 1 Months Ended
Mar. 31, 2017
Sep. 30, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Common stock authorized (in shares)   19,333,333 19,333,333
Common stock, par value (in dollars per share)   $ 0.0001 $ 0.0001
Series 1 Common Stock      
Class of Stock [Line Items]      
Common stock authorized (in shares)   6,000,000  
Series 2 Common Stock      
Class of Stock [Line Items]      
Increase in common stock authorized (in shares) 555,555    
Common stock authorized (in shares)   13,333,333