Annual report pursuant to Section 13 and 15(d)

Business Acquisition - Additional Information (Detail)

v3.22.1
Business Acquisition - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Business acquisition, consideration paid in cash $ 128,953    
Payments to Acquire Businesses,Cash payment   $ 103,892  
Business Acquisition Cost Of Acquired, Shares, Value [1]   22,333  
Business Acquisition, Transaction Costs [2]   2,972  
Business Acquisition, Contributed Revenues   1,479  
Business Acquisition, Contributed Losses   (1,470)  
Exact Earth Acquisition [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 100.00%    
Business Acquisition Market Share Price $ 4.27    
Nonrecurring adjustments acquisition costs     $ 4,733
Exact Earth Acquisition [Member] | Cash [Member]      
Business Acquisition [Line Items]      
Business Acquisition Market Share Price $ 1.95505    
Exact Earth Acquisition [Member] | General And Administrative Expense [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Transaction Costs   $ 4,733  
Common Class A | Exact Earth Acquisition [Member]      
Business Acquisition [Line Items]      
Business acquisition share exchange ratio 0.1    
Pro Forma [Member] | Exact Earth Acquisition [Member]      
Business Acquisition [Line Items]      
Replacement Awards for Stock Options     $ 2,972
[1] Represents the fair value of 5,230,167 shares of Spire Class A common share transferred as of the November 30, 2021 ("acquisition date") as consideration (based on the closing market price of $4.27 per share on the acquisition date) consisting of 4,984,225 shares issued for outstanding exactEarth shares, in addition to 100,047 and 145,895 shares to settle exactEarth stock options and restricted stock units ("RSU"), respectively.
[2] $2,972 was treated as post-combination expense in connection with the replacement of exactEarth’s outstanding equity awards. This amount has been reflected in the Consolidated Statement of Operations for the year ended December 31, 2021.