Fair Value Measurements - Notes Receivable Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) promissoryNote	Dec. 31, 2023 USD ($) promissoryNote	Dec. 31, 2022 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, purchased, amount	$ 30.0	$ 30.0	$ 30.0
Number of outstanding convertible promissory notes | promissoryNote	2	2
Proceeds from public offering, net of issuance costs	$ 10.3
Bolt Threads, Inc.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Indefinite-lived intangible asset acquired	1.6
Deferred revenue	5.3
Cell Engineering
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Loans receivable, fair value	14.1	$ 14.1	7.7
Financing receivable, excluding accrued interest, after allowance for credit loss	21.0	21.0	$ 7.5
Senior Secured Note
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable	11.8
Loans receivable, fair value	$ 11.8	$ 11.8
Financing receivable, interest rate	12.00%	12.00%
Convertible Promissory Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable	$ 10.0
Loans receivable, fair value	$ 12.2	$ 12.2
Financing receivable, interest rate	8.00%	8.00%
Financing receivable, conversion to equity securities, price paid per share	80.00%	80.00%
Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input	0.15	0.15
Discount rate | Cell Engineering
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input	0.170	0.170	0.125
Minimum | Measurement Input, Scenario Probabilities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input	0.10	0.10
Minimum | Measurement Input, Scenario Probabilities | Cell Engineering
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input	0.05	0.05	0.15
Minimum | Term (in years) | Cell Engineering
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input, period		1 year	1 year
Maximum | Measurement Input, Scenario Probabilities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input	0.75	0.75
Maximum | Measurement Input, Scenario Probabilities | Cell Engineering
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input	0.85	0.85	0.55
Maximum | Term (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input, period	1 year
Maximum | Term (in years) | Cell Engineering
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Financing receivable, measurement input, period		2 years	3 years