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Summary of Significant Accounting Policies - Potential Common Shares Excluded from Computations of Diluted Net Loss Per Share (Details) - shares shares in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities excluded from computations of net loss per share (in shares) | 103,894 | 27,488
Stock options, restricted stock units and performance awards |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities excluded from computations of net loss per share (in shares) | 7,988 | 6,974
Series B Convertible Preferred Stock Purchase Agreements |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities excluded from computations of net loss per share (in shares) | 66,176 | 0
Bridge Loans | Bridge Loans |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities excluded from computations of net loss per share (in shares) | 8,979 | 0
2019 Convertible Notes | Convertible Notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities excluded from computations of net loss per share (in shares) | 18,966 | 18,966
2019 Convertible Notes potential make-whole shares | Convertible Notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities excluded from computations of net loss per share (in shares) | 1,775 | 1,538
2014 Convertible Notes | Convertible Notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities excluded from computations of net loss per share (in shares) | 10 | 10

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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