Spire Global, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Stock Based Compensation - Additional Information (Details)

v3.25.1

Stock Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Aggregate intrinsic value of options exercised in period	$ 251	$ 1
Proceeds from exercise of stock options	$ 335	$ 3
Weighted average grant-date fair value	$ 5.15	$ 2.77
Fair value of options vested	$ 3,024	$ 3,729
Number of Stock Options Granted	33,901	61,446
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense vesting period	1 year
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense vesting period	4 years
Restricted Stock Units (RSUs)
Defined Benefit Plan Disclosure [Line Items]
Unrecognized stock-based compensation expense	$ 23,792
Unrecognized stock-based compensation expense, weighted-average recognition period	1 year 10 months 20 days
Fair value of options vested	$ 15,526	$ 14,294
2021 Equity Incentive Plan [Member] \| Employee Stock Option
Defined Benefit Plan Disclosure [Line Items]
Share based compensation arrangement,Number of shares available for grant under the plan	596,830
Purchase Price of Common Stock, Percent	85.00%
2021 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs)
Defined Benefit Plan Disclosure [Line Items]
Share based compensation arrangement,Number of shares available for grant under the plan	572,038
2021 Equity Incentive Plan [Member] \| Common Class A [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Outstanding Stock Maximum	5.00%
2021 Equity Incentive Plan [Member] \| Common Class A [Member] \| Lesser [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of shares issued under share-based payment arrangement	2,994,000

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