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Capitalization - Schedule of Mandatory Conversion of Convertible Promissory Notes into Preferred Stock (Parenthetical) (Detail)
Aug. 08, 2017
USD ($)
$ / shares
shares
Series A Preferred Stock [Member]  
Debt Conversion [Line Items]  
Shares issued, price per share | $ / shares $ 7.66
Convertible Promissory Notes [Member] | Note Purchase Agreement [Member]  
Debt Conversion [Line Items]  
Target valuation amount | $ $ 16,000,000
Number of outstanding shares used for calculation of conversion price | shares 3,863,547
Convertible Promissory Notes [Member] | Note Purchase Agreement - Related Parties [Member]  
Debt Conversion [Line Items]  
Target valuation amount | $ $ 16,000,000
Number of outstanding shares used for calculation of conversion price | shares 3,863,547
Convertible Promissory Notes [Member] | Second Note Purchase Agreement - Related Parties [Member]  
Debt Conversion [Line Items]  
Conversion percentage 80.00%