Income Taxes - Schedule of Changes in Valuation Allowance (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
Income Tax Disclosure [Abstract] | ||
Valuation allowance at beginning of year | $ (55,825) | $ (47,399) |
Increases recorded to income tax provision | (6,107) | (8,426) |
Valuation allowance at end of year | $ (61,932) | $ (55,825) |