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Related Party Transactions - Additional Information (Details) - One Of The Founders - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]      
Annual consulting fees to company founder $ 50,000    
Consulting fees 0 $ 25,000  
Outstanding liability to related party $ 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