XML 32 R12.htm IDEA: XBRL DOCUMENT v3.22.1
Short-term Investments
12 Months Ended
Dec. 31, 2021
Short-term Investments [Abstract]  
Short-term Investments

3. SHORT-TERM INVESTMENTS

Short-term investments consisted of the following:

 

 

 

As of December 31,

 

 

 

2020

 

 

2021

 

 

 

US$

 

 

US$

 

Aggregate cost

 

 

766,295

 

 

 

2,764,244

 

Gross unrealized gain

 

 

 

 

 

142,100

 

Aggregate fair value

 

 

766,295

 

 

 

2,906,344