Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of common stock reserved for future issuance (Detail)

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Stockholders' Equity - Schedule of common stock reserved for future issuance (Detail) - shares
Dec. 31, 2019
May 31, 2019
Mar. 31, 2019
Schedule Of Common Stock Reserved For Future Issuance [Line Items]      
Conversion of Series A preferred stock 10,000    
Options outstanding 4,209,573   189,269
Options available for future option grants 5,478,728   3,478,728
Common stock purchase warrants 5,750,000 5,750,000  
Total 15,448,301   3,667,997