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Stock-Based Compensation - Summary of Stock Option Activity for 2015 Private Dare Plan and 2014 Plan and Related Information (Detail) (Parenthetical) - shares
Jun. 30, 2018
Dec. 31, 2017
Jul. 19, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding 547,571 539,896  
Private Dare [Member] | Stock Options [Member] | 2015 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding 10,149   50,000