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Debt - Summary of Interest Expense Recognized Related to Notes (Detail) - Convertible Senior Notes [Member]
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Debt Instrument [Line Items]  
Contractual interest expense $ 0.1
Amortization of debt discount 0.7
Amortization of debt issuance costs 0.1
Total $ 0.9