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Share-Based Payment Arrangements - Summary of Reconciliation of Outstanding Share Options (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
2021 GHL Plan [Member]        
Statement [Line Items]        
Ending balance - Number of Share Options | shares 18,010      
Beginning balance - Weighted average exercise price per share | $ / shares $ 1.98      
Exercised - Weighted average exercise price per share | $ / shares   $ 0.81    
Cancelled and forfeited - Weighted average exercise price per share | $ / shares   1.73    
Ending balance - Weighted average exercise price per share | $ / shares $ 1.76 $ 1.98    
Weighted-average remaining contractual life   7 years 9 months 21 days    
Share options [member] | GHI 2018 Plan and GHI 2015 Plan [Member]        
Statement [Line Items]        
Beginning balance - Number of Share Options | shares 114,243 115,212 89,944  
Granted - Number of Share Options | shares 2,848 11,736 41,220  
Exercised - Number of Share Options | shares (62,220) (7,308) (8,612)  
Cancelled and forfeited - Number of Share Options | shares (1,564) (5,397) (7,340)  
Effect of replacement of GHI 2018 and 2015 Equity Incentive Plans with 2021 GHL Plan as a part of Reverse Recapitalisation - Number of Share Option | shares (53,307)      
Ending balance - Number of Share Options | shares 0 114,243 115,212 89,944
Beginning balance - Weighted average exercise price per share | $ / shares $ 1.17 $ 1.06 $ 0.61  
Granted - Weighted average exercise price per share | $ / shares 1.29 1.85 1.87  
Exercised - Weighted average exercise price per share | $ / shares 0.81 0.59 0.55  
Cancelled and forfeited - Weighted average exercise price per share | $ / shares 1.04 0.99 0.68  
Ending balance - Weighted average exercise price per share | $ / shares $ 0 $ 1.17 $ 1.06 $ 0.61
Exercisable - Number of Share Options | shares   57,634 38,507  
Exercisable - Weighted average exercise price per share | $ / shares   $ 0.80 $ 0.53  
Weighted-average remaining contractual life   7 years 6 months 14 days 8 years 2 months 15 days 8 years 2 months 23 days
Share options [member] | 2021 GHL Plan [Member]        
Statement [Line Items]        
Beginning balance - Number of Share Options | shares 53,096 53,307    
Exercised - Number of Share Options | shares   (188)    
Cancelled and forfeited - Number of Share Options | shares   (23)    
Ending balance - Number of Share Options | shares   53,096 53,307  
Beginning balance - Weighted average exercise price per share | $ / shares   $ 1.97    
Ending balance - Weighted average exercise price per share | $ / shares     $ 1.97  
Weighted-average remaining contractual life   7 years 4 months 28 days