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Fair Value Measurements - Additional Information (Detail) - Significant Unobservable Inputs (Level 3) | Sep. 30, 2021
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Stock Price Volatility |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Derivative liabilities, unobservable inputs rate | 63.0
Stock Price Volatility | Minimum |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Warrant liabilities, stock price volatility rate | 67.2
Stock Price Volatility | Maximum |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Warrant liabilities, stock price volatility rate | 79.8
Stock Price Volatility | Weighted Average |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Warrant liabilities, stock price volatility rate | 78.9
Market Credit Spread |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Derivative liabilities, unobservable inputs rate | 1,408
Estimated Yield |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Derivative liabilities, unobservable inputs rate | 14.7
Discounts for Lack of Marketability | March 2019 Notes |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Senior convertible notes, unobservable inputs rate | 6.3

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