v3.26.1
SHARE-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2026
SHARE-BASED COMPENSATION  
Summary of stock option activity

Weighted

Average

Weighted

Weighted

Grant

Average

Average

Date

Remaining

Aggregate

Number of

Exercise

Fair

Contractual

Intrinsic

  ​ ​ ​

Options

  ​ ​ ​

Price

  ​ ​ ​

Value

  ​ ​ ​

Term

  ​ ​ ​

Value

US$ per

US$ per

option

option

Years

US$

Outstanding at December 31, 2024

9,847,240

2.55

2.49

8.36

1,736,202

Granted

3,424,440

1.41

0.88

Exercised

(3,250)

1.08

0.66

Forfeited

(442,646)

 

3.11

 

2.12

 

 

Outstanding at June 30, 2025

12,825,784

 

2.23

 

2.07

 

8.40

 

2,046,458

Outstanding at December 31, 2025

12,416,354

2.20

1.91

8.03

1,660,307

Granted

3,136,333

2.10

1.36

Exercised

(326,933)

1.27

1.68

Forfeited

(105,000)

1.96

1.25

Outstanding at June 30, 2026

15,120,754

2.20

1.80

7.99

25,196,630

Vested and expected to vest at June 30, 2026

15,120,754

2.20

1.80

7.99

25,196,630

Exercisable at June 30, 2025

4,863,411

3.49

3.96

6.86

759,771

Exercisable at June 30, 2026

7,301,789

2.76

2.57

7.02

12,010,060

Summary of assumptions used to estimate the fair value of the share options granted

For the Six Months Ended June 30,

  ​ ​ ​

2025

  ​ ​ ​

2026

Risk‑free interest rate

4.24% - 4.49%

4.21% - 4.5 %

Dividend yield

0%

0%

Expected volatility range

76.4% - 77.1%

76.0% - 78.6%

Exercise multiple

2.2 - 2.8

2.2 - 2.8

Contractual life

10 years

10 years

Summary of total share based compensation expenses recognized

For the Six Months Ended June 30,

  ​ ​ ​

2025

  ​ ​ ​

2026

US$

US$

Research and development expenses

 

1,393,980

 

1,373,432

Administrative expenses

 

636,355

 

758,326

Total share‑based compensation expenses

 

2,030,335

 

2,131,758