Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Other Assets [Line Items] | ||
| Reduction of accrued bonuses and other employee related expenses in settlement of employee notes receivable | $ 0 | $ 60 |
| 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.
|