Income Taxes - Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Income Tax Disclosure [Abstract] | ||
| United States | $ 0 | $ 0 |
| State | (17) | (4) |
| Total current tax provision | (17) | (4) |
| Total deferred tax provision | 0 | 0 |
| Total | $ (17) | $ (4) |