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Convertible Notes - Summary of the carrying value of the convertible notes (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 325,000 | $ 175,000
Plus: premium |  | 250 | 250
Gross proceeds |  | 325,250 | 175,250
Less: Unamortized discount (1) | [1] | 0 | (4,207)
Less: Unamortized issuance costs(1) | [1] | (7,271) | (4,397)
Carrying amount |  | $ 317,979 | $ 166,646
Effective interest rate(2) | [2] | 4.60% | 6.29%
2021 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 150,000 |
Plus: premium |  | 0 |
Gross proceeds |  | 150,000 |
Less: Unamortized discount (1) | [1] | 0 |
Less: Unamortized issuance costs(1) | [1] | (4,045) |
Carrying amount |  | $ 145,955 |
Effective interest rate(2) | [2] | 3.83% |
2020 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 175,000 |
Plus: premium |  | 250 |
Gross proceeds |  | 175,250 |
Less: Unamortized discount (1) | [1] | 0 |
Less: Unamortized issuance costs(1) | [1] | (3,226) |
Carrying amount |  | $ 172,024 |
Effective interest rate(2) | [2] | 5.26% |
[1] | Unamortized discount was reduced by $4,207 and unamortized issuance costs increased by $119 upon the early adoption of ASU 2020-06 on January 1, 2021. The discount previously arose from the bifurcation of the conversion option which occurred prior to the adoption of ASU 2020-06. The unamortized issuance costs are reported net of the unamortized premium.
[2] | Includes amortization of the issuance costs and premium. The effective interest rate prior to January 1, 2021 also included amortization of the discount arising from the bifurcation of the conversion option.

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