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Summary of Significant Accounting Policies - Preferred Stock Discount (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
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Feb. 28, 2021 | Sep. 30, 2021
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |
Conversion of Series X Preferred Stock into common stock |  | $ 168,920
Private Placement |  |
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |
Conversion of Series X Preferred Stock into common stock |  | 900
Private Placement | Series X redeemable convertible preferred stock |  |
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |
Beneficial conversion feature | $ 19,600 |
Issuance costs | $ 5,700 |
Non cash return |  | $ 24,400

X
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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of deferred taxes for convertible debt with a beneficial conversion feature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=124434304&loc=d3e34017-109320 + Details
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