Spire Global, Inc. Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Estimated Fair Value of Private Placement Warrants (Details) - Level 2	Mar. 31, 2021	Dec. 31, 2020
Exercise Price
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Warrants, measurement input	11.50	11.50
Stock Price
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Warrants, measurement input	10.02	10.01
Expected Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Warrants, measurement input	21.07	18.42
Expected Term (Years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Warrants expiration term	1 year	1 year
Risk-Free Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Warrants, measurement input	1.04	0.40
Dividend Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Warrants, measurement input	0.00	0.00