Post-effective amendment to a registration statement that is not immediately effective upon filing

Convertible Notes - Additional Information (Detail)

v3.22.1
Convertible Notes - Additional Information (Detail)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended 16 Months Ended
May 31, 2021
Dec. 31, 2012
Feb. 28, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Debt Instrument [Line Items]            
Debt instrument interest rate stated percentage           8.00%
Debt issuance costs, net       $ 24,852 $ 4,798  
Stockholders' equity note, stock split, exchange ratio   1.8282        
Interest expense debt       $ 2,103 4,490  
New Spire Class A Common stock [Member]            
Debt Instrument [Line Items]            
Stockholders' equity note, stock split, exchange ratio       1.7058    
2019 and 2020 convertible notes [Member]            
Debt Instrument [Line Items]            
Proceeds from issuance of convertible debt           $ 42,884
Debt instrument maturity date Jul. 31, 2022         Jan. 29, 2022
Percentage of principal payment to be paid on maturity date if unconverted           5.00%
Debt issuance costs, net           $ 392
2021 convertible notes [Member]            
Debt Instrument [Line Items]            
Proceeds from issuance of convertible debt     $ 20,000      
Debt instrument interest rate stated percentage     8.00%      
Debt issuance costs, net     $ 62      
Debt Instrument convertible conversion ratio       13.6466    
Debt Instrument, Term     4 years      
2019 Convertible Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument convertible conversion ratio       2.4808    
2020 Convertible Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument convertible conversion ratio       2.4808    
Convertible notes payable [Member]            
Debt Instrument [Line Items]            
Accrued interest       $ 0 $ 5,944  
Debt Instrument, Increase, Accrued Interest       $ 1,698