Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.21.1
Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 10, 2020
Oct. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Line Items]          
Impairment of long lived assets held for use     $ 496 $ 0  
Proceeds from redeemable convertible preferred stock     8,934 161,233 $ 0
Reduction in revenue     14,800    
Performance obligations transaction price     11,000    
Severance pay expense     2,000 1,700 $ 1,100
Deferred offering costs non current     374 0  
Contract with customers liability recognized     283    
Deferred Revenue     $ 3,500 $ 3,500  
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 $ 31 $ 9
Memorandum Of Understanding With Magna International [Member]          
Accounting Policies [Line Items]          
Advances from customers and deferred revenues     $ 736    
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 2,699,114    
Proceeds from redeemable convertible preferred stock   $ 8,934      
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