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PREPAID LICENSING AND ROYALTY FEES
 12 Months Ended
Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
PREPAID LICENSING AND ROYALTY FEES

NOTE 3. PREPAID LICENSING AND ROYALTY FEES

The following table summarizes changes to our Company’s prepaid licensing and royalty fees:

 

(in US$ thousands)

 

2022

 

 

2021

 

 

2020

 

Balance at beginning of year

 

$

35

 

 

$

130

 

 

$

44

 

Addition

 

 

369

 

 

 

98

 

 

 

340

 

Amortization and usage

 

 

(227

)

 

 

(193

)

 

 

(254

)

Impairment charges

 

 

—

 

 

 

—

 

 

 

—

 

Balance at end of year

 

$

177

 

 

$

35

 

 

$

130

 

 

 

We recognized impairment losses of $0 at the end of 2022, 2021 and 2020, for the prepaid licensing and royalty fees.