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Net Loss Per Share - Additional Information (Detail) shares in Millions | 12 Months Ended
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Dec. 31, 2020 shares
Convertible Note due 2022 [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | 6.6
Convertible Note due 2024 [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | 13.3

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