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Convertible Notes - Schedule of key terms of convertible notes (Detail) | 9 Months Ended
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Sep. 30, 2021 $ / shares shares
2021 Notes |
Debt Instrument [Line Items] |
Maturity date (unless earlier converted, repurchased or redeemed) | Jun. 15, 2026
Interest rate | 3.25%
Conversion price | $ 11.04
Conversion rate | shares | 90.5797
Redemption price | $ 14.35
2020 Notes |
Debt Instrument [Line Items] |
Maturity date (unless earlier converted, repurchased or redeemed) | Jun. 15, 2023
Interest rate | 4.25%
Conversion price | $ 5.92
Conversion rate | shares | 168.9189
Redemption price | $ 7.70

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