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Summary of Significant Accounting Policies - Narrative (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended
Jan. 31, 2019
CAD ($)
Sep. 30, 2021
USD ($)
plan
Segment
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Significant Accounting Policies [Line Items]          
Escrow deposit fair value         $ 1,300,000
Escrow deposit   $ 300,000   $ 300,000  
Grants received   100,000 $ 100,000    
Impairment of long lived assets   0 0    
Accretion expense for debt issuance cost   $ 2,200,000 $ 0    
Exercise price (in dollars per share) | $ / shares   $ 11.50      
Outstanding warrants (in shares) | shares   35,476,667      
Percent of occurrence of a tender offer or exchange of our stockholders   50.00%      
Number of equity incentive plans (in plans) | plan   2      
Number of operating segments (in segments) | Segment   1      
Total assets   $ 514,094,000   47,428,000  
Public Warrants          
Significant Accounting Policies [Line Items]          
Number of warrants assumed (in shares) | shares   24,150,000      
Outstanding warrants (in shares) | shares   24,150,000      
Private Placement Warrants          
Significant Accounting Policies [Line Items]          
Number of warrants assumed (in shares) | shares   11,326,667      
Outstanding warrants (in shares) | shares   11,326,667      
Maximum          
Significant Accounting Policies [Line Items]          
Reimbursement for eligible expenditure $ 2.7        
Estimated useful lives   5 years      
Intangible assets, estimated useful lives   15 years      
Minimum          
Significant Accounting Policies [Line Items]          
Estimated useful lives   3 years      
Intangible assets, estimated useful lives   7 years      
Outside United States          
Significant Accounting Policies [Line Items]          
Total assets   $ 50,100,000   45,400,000  
Standby Letters of Credit          
Significant Accounting Policies [Line Items]          
Letter of credit   $ 200,000   $ 200,000