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Net Loss Per Share (Details) - $ / shares | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Warrant, exercise price (in dollars per share) | $ 75.90 |
Warrant, exercise period (in years) | 5 years |
Stock options |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive stock options outstanding (in shares) | 1,364,000 | 989,000
Restricted Stock Unit Awards |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive stock options outstanding (in shares) | 468,000 | 375,000
Convertible Debt Securities | Convertible Notes | Convertible Senior Notes due 2024 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive stock options outstanding (in shares) | 638,051 |
Initial conversion price (in dollars per share) | $ 46.4037 |
Convertible Debt Securities | Convertible Notes | Convertible Senior Notes Due 2026 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive stock options outstanding (in shares) | 3,700,272 |
Initial conversion price (in dollars per share) | $ 30.8356 |
Convertible Debt Securities | Convertible Notes | Convertible Senior Notes Due 2027 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive stock options outstanding (in shares) | 4,732,132 |
Initial conversion price (in dollars per share) | $ 17.8571 |

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