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

Fair Value Measurement - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

Fair Value Measurement - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Liabilities:
Warrant liability	$ 22,582	$ 0
Fair Value, Recurring [Member]
Long-term Liabilities:
Warrant liability	107,900
Fair Value, Recurring [Member] \| Public Warrants [Member]
Long-term Liabilities:
Warrant liability	19,550
Fair Value, Recurring [Member] \| Private Placement Warrants [Member]
Long-term Liabilities:
Warrant liability	11,220
Fair Value, Recurring [Member] \| Contingent Earnoutliability Member [Member]
Long-term Liabilities:
Warrant liability	77,130
Fair Value, Recurring [Member] \| E I B warrants [Member]
Current Liabilities:
Warrant liability	22,582
Fair Value, Recurring [Member] \| Level 1 [Member]
Long-term Liabilities:
Warrant liability	19,550
Fair Value, Recurring [Member] \| Level 1 [Member] \| Public Warrants [Member]
Long-term Liabilities:
Warrant liability	19,550
Fair Value, Recurring [Member] \| Level 2 [Member]
Long-term Liabilities:
Warrant liability	11,220
Fair Value, Recurring [Member] \| Level 2 [Member] \| Private Placement Warrants [Member]
Long-term Liabilities:
Warrant liability	11,220
Fair Value, Recurring [Member] \| Level 2 [Member] \| E I B warrants [Member]
Current Liabilities:
Warrant liability	22,582
Fair Value, Recurring [Member] \| Level 3 [Member]
Long-term Liabilities:
Warrant liability	77,130
Fair Value, Recurring [Member] \| Level 3 [Member] \| Contingent Earnoutliability Member [Member]
Long-term Liabilities:
Warrant liability	$ 77,130
Fair Value, Recurring [Member] \| Warrant Liabilities [Member]
Long-term Liabilities:
Warrant liability		4,007
Fair Value, Recurring [Member] \| Warrant Liabilities [Member] \| Level 3 [Member]
Long-term Liabilities:
Warrant liability		$ 4,007