Summary of significant accounting policies - Summary of Estimated Useful Life of Asset (Detail) |
12 Months Ended |
|---|---|
Dec. 31, 2021 | |
| Lab Equipment [Member] | |
| Property Plant And Equipment [Line Items] | |
| Estimated useful life of asset | 3 years |
| Computer Equipment [Member] | |
| Property Plant And Equipment [Line Items] | |
| Estimated useful life of asset | 3 years |
| Vehicles [Member] | |
| Property Plant And Equipment [Line Items] | |
| Estimated useful life of asset | 4 years |
| Leasehold Improvements [Member] | |
| Property Plant And Equipment [Line Items] | |
| Estimated useful life of asset | Shorter ofthe usefullife orremaininglease term |
| Minimum [Member] | Furniture and Office Equipment [Member] | |
| Property Plant And Equipment [Line Items] | |
| Estimated useful life of asset | 3 years |
| Maximum [Member] | Furniture and Office Equipment [Member] | |
| Property Plant And Equipment [Line Items] | |
| Estimated useful life of asset | 8 years |