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Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jan. 01, 2019
Jul. 10, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options outstanding (in shares)     2,016,888   2,016,888   1,635,790
Common stock, shares outstanding (in shares)     16,683,411   16,683,411   11,422,161
Unamortized stock-based compensation expense     $ 1,348,159   $ 1,348,159    
Amortized weighted average period         2 years 10 months 24 days    
Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options outstanding (in shares)   2,000,000          
Stock-based compensation expense     $ 111,351 $ 9,423 $ 209,319 $ 18,547  
Options to purchase number of outstanding shares of common stock (in shares) 2,503,771 2,046,885          
Annual percentage increase in outstanding number of common stock 4.00% 4.00%          
Increase in number of shares authorized (in shares) 456,886            
Common stock reserved for future issuance (in shares)     497,032   497,032    
2015 Stock Incentive Plan | Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options outstanding (in shares)     10,149   10,149    
2015 Stock Incentive Plan | Employee Stock Option | Private Dare              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options outstanding (in shares)             10,149
2015 Stock Incentive Plan | Restricted Stock | Private Dare              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares outstanding (in shares)     223,295   223,295    
2014 Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense         $ 0 $ 0