SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2022

SHARE-BASED COMPENSATION

Schedule of Share-based compensation recognized in operating expenses

	Year ended December 31,
	2020	2021	2022
	(HK$ in thousands)
Research and development expenses	20,579	75,755	145,226
General and administrative expenses	10,354	14,020	44,099
Selling and marketing expenses	1,640	9,138	15,204
Total share-based compensation expenses	32,573	98,913	204,529

Schedule of the stock option activity under the 2014 and 2019 Share Incentive Plan

	Options granted	Weighted average
	share number	exercise price per option (US$)
Outstanding at January 1, 2020	23,718,626	0.5161
Exercised	(5,048,824)	0.4293
Granted	2,489,832	0.6810
Forfeited	(2,117,298)	0.5588
Outstanding at December 31, 2020	19,042,336	0.5628
Exercised	(5,875,592)	0.4365
Granted	1,080,000	0.0444
Forfeited	(905,278)	0.6539
Outstanding at December 31, 2021	13,341,466	0.5703
Exercised	(2,968,984)	0.6110
Forfeited	(386,336)	0.6381
Outstanding at December 31, 2022	9,986,146	0.5556

Schedule of share options outstanding

	As of December 31, 2022
			Weighted-
			average
		Weighted-	remaining
		average	exercise
	Options	exercise price	contractual life	Aggregate
	number	per option	(years)	intrinsic value
		US$		US$ in thousand
Options
Outstanding	9,986,146	0.5556	2.59	45,882
Exercisable	3,568,221	0.5505	2.05	16,413
Expected to vest	6,417,925	0.5584	2.89	29,470

Schedule of fair value of options granted using the binomial option pricing model

	2020		2021		2022
Risk-free interest rate	0.27%-0.36	%	0.09%-0.89	%	NA
Expected term (in years)	5.00		5.00		NA
Expected dividend yield	0	%	0	%	NA
Expected volatility	40	%	40	%	NA
Expected forfeiture rate (post-vesting)	15	%	15	%	NA

Schedule of activities of the restricted share units granted to employees under the plan

		Weighted -
		average grant date
	Shares awarded number	fair value per share(US$)
Outstanding at January 1, 2020	—	—
Granted	6,067,400	4.6827
Outstanding at December 31, 2020	6,067,400	4.6827
Vested	(929,672)	4.6827
Granted	12,105,712	5.7371
Forfeited	(281,576)	5.4426
Outstanding at December 31, 2021	16,961,864	5.6793
Vested	(3,138,104)	5.7371
Granted	14,357,520	5.0877
Forfeited	(1,489,032)	5.5209
Outstanding at December 31, 2022	26,692,248	5.3631