Spire Global, Inc. General form of registration statement for all companies including face-amount certificate companies

Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 0	$ 0

Amount of contribution received by defined benefit plan from employer which increases plan assets.