Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
|
| Other Assets [Line Items] | ||
| Reduction of accrued bonuses and other employee related expenses in settlement of employee notes receivable | $ 10 | $ 0 |
| X | ||||||||||
- Definition Other Assets [Line Items] No definition available.
|
| X | ||||||||||
- Definition Reduction of accrued bonuses and other employee related expenses in settlement of employee notes receivable. No definition available.
|