Consolidated Statements of Changes in Shareholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Private Placement
Initial Public Offering Including Over Allotment Option [Member]
Common Class A
Common Class B
Ordinary shares
Ordinary shares
Common Class A
Ordinary shares
Common Class A
Restricted Stock Units (RSUs)
Ordinary shares
Common Class A
Private Placement
Ordinary shares
Common Class A
Initial Public Offering Including Over Allotment Option [Member]
Ordinary shares
Common Class B
Additional paid-in capital
Additional paid-in capital
Restricted Stock Units (RSUs)
Additional paid-in capital
Private Placement
Additional paid-in capital
Initial Public Offering Including Over Allotment Option [Member]
Accumulated other comprehensive income (loss)
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2018           112,441,049 0       0            
Beginning balance at Dec. 31, 2018 $ (73,242)         $ 11           $ 0       $ (630) $ (72,623)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Vesting of restricted shares (Note 15) (in shares)           6,733,333                      
Vesting of restricted shares (Note 15) 78         $ 1           77          
Share-based compensation expense (Note 15) 3,159                     3,159          
Repurchase of restricted shares (Note 15) (in shares)           (100,000)                      
Repurchase of restricted shares (Note 15) (84)                     (84)          
Reclassification of liability-classified awards to equity-classified awards (Note 15) 48                     48          
Accretion on convertible redeemable preferred shares to redemption value (Note 13) (50,716)                     (3,200)         (47,516)
Net income (loss) (6,177)                               (6,177)
Foreign currency translation adjustments (358)                             (358)  
Unrealized gain on debt securities 0                                
Ending balance (in shares) at Dec. 31, 2019           119,074,382 0       0            
Ending balance at Dec. 31, 2019 (127,292)         $ 12           0       (988) (126,316)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Vesting of restricted shares (Note 15) (in shares)           2,805,556                      
Vesting of restricted shares (Note 15) 0                                
Share-based compensation expense (Note 15) 8,521                     8,521          
Conversion of ordinary shares to Class A and Class B Ordinary Shares (in shares)           (121,879,938) 45,700,000       76,179,938            
Conversion of ordinary shares to Class A and Class B Ordinary Shares 0         $ (12) $ 4       $ 8            
Accretion on convertible redeemable preferred shares to redemption value (Note 13) (193,465)                     (158,949)         (34,516)
Conversion of convertible redeemable preferred shares to Class A ordinary shares (Note 14) (in shares)             182,917,991                    
Conversion of convertible redeemable preferred shares to Class A ordinary shares (Note 14) 483,436           $ 18         483,418          
Issuance of Class A ordinary shares (in shares)                 22,000,000 80,500,000              
Issuance of Class A ordinary shares   $ 110,000 $ 373,638           $ 2 $ 8       $ 109,998 $ 373,630    
Net income (loss) (3,115)                               (3,115)
Foreign currency translation adjustments 2,929                             2,929  
Shares issued as part of an acquisition (in shares)             84,634                    
Shares issued as part of an acquisition (Note 3) 850                     850          
Unrealized gain on debt securities $ 0                                
Exercise of options (in shares) 7,632,431           7,632,431                    
Exercise of options $ 961           $ 1         960          
Ending balance (in shares) at Dec. 31, 2020 415,014,994     338,835,056 76,179,938 0 338,835,056       76,179,938            
Ending balance at Dec. 31, 2020 $ 656,463         $ 0 $ 33       $ 8 818,428       1,941 (163,947)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Vesting of restricted shares (Note 15) (in shares)               384,585                  
Vesting of restricted shares (Note 15) 78             $ 0         $ 78        
Share-based compensation expense (Note 15) 25,645                     25,645          
Accretion on convertible redeemable preferred shares to redemption value (Note 13) (193,500)                                
Issuance of Class A ordinary shares (in shares)                 20,000,000                
Issuance of Class A ordinary shares   $ 249,950             $ 2         $ 249,948      
Net income (loss) (72,355)                               (72,355)
Foreign currency translation adjustments 1,307                             1,307  
Settlement of VPP (Note 15) 3,512           $ 0         3,512          
Unrealized gain on debt securities $ (99)                             (99)  
Exercise of options (in shares) 14,235,844           14,235,844                    
Exercise of options $ 1,760           $ 2         1,758          
Ending balance (in shares) at Dec. 31, 2021 449,635,423     373,455,485 76,179,938 0 373,455,485       76,179,938            
Ending balance at Dec. 31, 2021 $ 866,261         $ 0 $ 37       $ 8 $ 1,099,369       $ 3,149 $ (236,302)