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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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Contractual interest rate for funds borrowed, under the debt agreement.

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