Fair Value Measurements - Additional Information (Detail) - USD ($) |
Jun. 30, 2020 |
Dec. 31, 2019 |
Jun. 30, 2019 |
---|---|---|---|
Fair Value Disclosures [Abstract] | |||
Fair value, assets transfers from Level 1 to Level 2 measurement | $ 0 | $ 0 | |
Fair value, assets transfers from Level 2 to Level 1 measurement | 0 | $ 0 | |
Restricted investments | $ 1,400,000 | $ 1,400,000 |