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

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.21.2
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 10, 2020
Oct. 01, 2020
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 17, 2021
Accounting Policies [Line Items]                
Impairment of long lived assets held for use         $ 496,000 $ 0    
Proceeds from redeemable convertible preferred stock         8,934,000 161,233,000    
Reduction in revenue         14,800,000      
Performance obligations transaction price     $ 12,500,000 $ 12,500,000 11,000,000      
Severance pay expense         2,000,000 1,700,000 $ 1,100,000  
Deferred offering costs non current         374,000 0    
Contract with customers liability recognized       95,000 283,000      
Deferred Revenue     $ 3,473,000 $ 3,473,000 $ 3,473,000 $ 3,500,000    
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 11.50 $ 11.50        
Redemption price of outstanding warrants in whole and not in part     0.01 $ 0.01        
Share price               $ 10
Warrants And Rights Subject To Mandatory Redemption One [Member]                
Accounting Policies [Line Items]                
Period to exercise warrants after business combination       30 days        
Number of trading days for determining the share price       20 days        
Number of consecutive trading days for determining the share price       30 days        
Minimum [Member]                
Accounting Policies [Line Items]                
Share price     $ 18 $ 18        
Public Warrants [Member]                
Accounting Policies [Line Items]                
Stock Issued During Period, Value, New Issues       $ 7,499,991        
private Warrants [Member]                
Accounting Policies [Line Items]                
Stock Issued During Period, Value, New Issues       1,918,750        
Section Four Hundred And One K Plan [Member]                
Accounting Policies [Line Items]                
Employer matching contribution percentage         4.00% 4.00% 4.00%  
Employer matching contribution to retirement plan amount         $ 14,000 $ 31,000 $ 9,000  
Memorandum Of Understanding With Magna International [Member]                
Accounting Policies [Line Items]                
Advances from customers and deferred revenues     $ 1,403,000 1,403,000 $ 736,000      
Merger Agreement [Member] | private Warrants [Member]                
Accounting Policies [Line Items]                
Stock Issued During Period, Value, New Issues       $ 6,812,500        
Israel [Member]                
Accounting Policies [Line Items]                
Severance pay percentage of monthly salary contribution to the fund         8.33%      
In Case Registered As Public Company [Member] | Performance Based Milestone [Member] | Performance Based Agreement With Magna [Member]                
Accounting Policies [Line Items]                
Class of warrants or rights or rights excercisable into shares issuable in the future 7,023,865              
Series C One Redeemable Convertible Preferred Shares [Member]                
Accounting Policies [Line Items]                
Temporary equity shares issued during the period new issues   943,148 346,678 346,678 2,699,114      
Proceeds from redeemable convertible preferred stock   $ 8,934,000            
Series C One Redeemable Convertible Preferred Shares [Member] | Memorandum Of Understanding With Magna International [Member]                
Accounting Policies [Line Items]                
Temporary equity shares issued during the period new issues 1,755,966              
Proceeds from redeemable convertible preferred stock $ 0              
Series C One Redeemable Convertible Preferred Shares [Member] | In Case Not Registered As A Public Company [Member] | Performance Based Milestone [Member] | Performance Based Agreement With Magna [Member]                
Accounting Policies [Line Items]                
Class of warrants or rights or rights excercisable into shares issuable in the future 4,939,922