Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Additional Information (Details)

v3.22.4
Stock Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Aggregate intrinsic value of options exercised in period $ 483 $ 5,339
Proceeds from exercise of stock options $ 806 $ 1,289
Weighted average grant-date fair value $ 0.95 $ 2.92
Aggregate intrinsic value of options outstanding $ 200 $ 26,865
Aggregate intrinsic value of options exercisable 200 18,639
Fair value of options vested $ 6,072 $ 3,908
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 $ 31,518  
Unrecognized stock-based compensation expense, weighted-average recognition period 2 years 3 months 18 days  
Old Spire Options    
Defined Benefit Plan Disclosure [Line Items]    
Stockholders' equity note, stock split, exchange ratio 1.8282  
2021 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option    
Defined Benefit Plan Disclosure [Line Items]    
Share based compensation arrangement,Number of shares available for grant under the plan 4,059,162  
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 5,685,295  
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 23,951,000