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Summary of Significant Accounting Policies - Preferred Stock Discount (Details) - Private Placement - Series X redeemable convertible preferred stock $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |
Beneficial conversion feature | $ 19.6
Issuance costs | 5.7
Non cash return | $ 24.4

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