Operating Expenses by Nature - Summary of Depreciation Expense (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Disclosure Of Depreciation Expense [Line Items] | |||
| Total depreciation | $ 736 | $ 721 | $ 737 |
| Research and development expenses [Member] | |||
| Disclosure Of Depreciation Expense [Line Items] | |||
| Total depreciation | 441 | 447 | 429 |
| General and administrative expenses [Member] | |||
| Disclosure Of Depreciation Expense [Line Items] | |||
| Total depreciation | $ 295 | $ 274 | $ 308 |