Fair Value Measurements - Disclosure Summary Of Changes In Fair Value Of Warrants Liability (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Balance as of December 31, 2019 | $ 42,628 | |||
| Net exercises in the period | (10,810) | |||
| Change in fair value of warrants | $ 9,201 | $ (784) | (811) | $ (2,743) |
| Reclassification to additional paid-in capital in result of conversion of preferred stock warrants to common stock warrants | 31,007 | 31,007 | ||
| Balance as of September 30, 2020 | $ 0 | 0 | ||
| Conversion Of Preferred Stock Warrants To Common Stock Warrants [Member] | ||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Reclassification to additional paid-in capital in result of conversion of preferred stock warrants to common stock warrants | $ (31,007) | |||