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Subsequent Events - Additional Information (Details)
1 Months Ended
Jul. 11, 2018
USD ($)
$ / shares
shares
Jul. 18, 2018
USD ($)
ft²
Jun. 30, 2018
USD ($)
$ / shares
shares
May 30, 2018
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Common Stock, Par or Stated Value Per Share | $ / shares     $ 0.001 $ 0.001 $ 0.001
Common Stock, Shares, Issued | shares     20,614,498   20,137,974
Security Deposit | $     $ 406,735   $ 339,558
Subsequent Event [Member] | Sub Sublandlord [Member]          
Area of Land | ft²   46,641      
Subsequent Event [Member] | Sub Sublease [Member]          
Lease Expiration Date   Dec. 15, 2023      
Security Deposit | $   $ 552,986.74      
Area of Real Estate Property | ft²   33,137      
Subsequent Event [Member] | Underwriting Agreement [Member]          
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.001        
Common Stock, Shares, Issued | shares 4,000,000        
Additional Shares of Common Stock Issued | shares 600,000        
Proceeds from Issuance Initial Public Offering | $ $ 155,400,000        
Subsequent Event [Member] | Underwriting Agreement [Member] | IPO [Member]          
Sale of Stock, Price Per Share | $ / shares $ 36.00