Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity - Schedule of equity awards (Detail)

v3.21.1
Stockholders' equity - Schedule of equity awards (Detail) - Employee stock option - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Options,Outstanding, beginning of period 587,290 69,710 70,154  
Stock Options, Granted   525,547    
Stock Options, Forfeited   (7,967) (444)  
Stock Options, Outstanding, end of period 587,290 587,290 69,710 70,154
Stock Options, Exercisable, end of period 41,686      
Exercise price, beginning of period $ 7.64 $ 60.00 $ 60.42  
Weighted-average Exercise Price, Granted   2.98    
Weighted-average Exercise Price, Forfeited   153.78 69.32  
Weighted-average Exercise Price, Exercise price, end of period 7.64 $ 7.64 $ 60.00 $ 60.42
Weighted-average Exercise Price, Exercisable, end of period $ 47.34      
Weighted-average Remaining Contractual Term, Outstanding 8 years 10 months 24 days 9 years 2 months 12 days 2 years 7 months 24 days 2 years 10 months 20 days
Weighted-average Remaining Contractual Term, Exercisable 2 years 3 months 18 days