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Convertible Senior Notes - Schedule of Interest Expense Related to Notes (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |
Contractual Interest Expense | $ 1,219 |
Amortization of Issuance Costs | 1,172 | $ 0
Total interest expense | 2,391 |
Convertible Senior Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Contractual Interest Expense | 1,219 |
Amortization of Issuance Costs | 739 |
Total interest expense | 1,958 |
Convertible Senior Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Contractual Interest Expense | 0 |
Amortization of Issuance Costs | 433 |
Total interest expense | $ 433 |

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