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Convertible Notes - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Temporary equity, conversion of convertible securities |  | $ (79,708,000) |  |
Group 1 Converted Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Valuation cap |  |  | $ 200,000,000 |
Convertible Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 21,540,000 |
Temporary equity, conversion of convertible securities | $ 21,500,000 |  |  |
Interest rate, stated percentage |  |  | 8.00% |
Unamortized debt discount |  |  | $ 4,884,000 |
Debt discount amortized |  |  | $ 1,704,000 |
Convertible Notes Payable | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, term |  |  | 1 year |
Convertible Notes Payable | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, term |  |  | 10 years |
Convertible Notes Payable | Group 1 Converted Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 6,400,000 |
Debt instrument, term |  |  | 10 years |
Conversion feature, intrinsic value |  |  | $ 0 |
Unamortized debt discount | 1,200,000 |  | $ 489,000 |
Convertible Notes Payable | Group 1 Converted Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, conversion threshold, percentage of per share price of equity issued In qualified financing |  |  | 0.80 |
Valuation cap |  |  | $ 10,000,000 |
Convertible Notes Payable | Group 1 Converted Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, conversion threshold, percentage of per share price of equity issued In qualified financing |  |  | 0.90 |
Convertible Notes Payable | Group 2 Converted Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 14,100,000 |  |  |
Conversion feature, intrinsic value |  |  | $ 0 |
Unamortized debt discount | $ 4,000,000 |  | $ 5,200,000 |
Convertible Notes Payable | Group 2 Converted Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, conversion threshold, percentage of per share price of equity issued In qualified financing |  |  | 0.80 |
Valuation cap |  |  | $ 30,000,000,000 |
Convertible Notes Payable | Group 2 Converted Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, conversion threshold, percentage of per share price of equity issued In qualified financing |  |  | 0.90 |
Valuation cap |  |  | $ 60,000,000,000 |
Convertible Notes Payable | Group 3 Converted Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,000,000
Conversion feature, intrinsic value |  |  |  | 0
Unamortized debt discount |  |  | 645,000 | 0
Debt discount amortized |  |  | $ 0 | $ 0
Debt instrument, convertible, percentage of equity instruments |  |  |  | 0.02

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