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Related Party Transactions - Additional Information (Details) - One Of The Founders - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Annual consulting fees to company founder     $ 50,000    
Consulting fees $ 0 $ 13,000 0 $ 38,000  
Outstanding liability to related party $ 0   $ 0   $ 0
Stock Option          
Related Party Transaction [Line Items]          
Shares issued to related party converted into stock options     13,852    
Unvested Restricted Common Stock          
Related Party Transaction [Line Items]          
Shares issued to related party converted into restricted stock awards     43,290