Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.21.2
Subsequent Events - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2019
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Oct. 31, 2021
Subsequent Event [Line Items]              
Total revenue     $ 2,379,000 $ 4,298,000 $ 20,733,000 $ 15,348,000  
Vertex Collaboration Agreement              
Subsequent Event [Line Items]              
Upfront payment $ 38,000,000.0            
Vertex Collaboration Agreement | Forecast | Research And Development Revenue              
Subsequent Event [Line Items]              
Total revenue   $ 14,600,000          
Vertex Collaboration Agreement | Subsequent Event              
Subsequent Event [Line Items]              
Outstanding performance obligations, payments             $ 0