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PREPAID LICENSING AND ROYALTY FEES (Tables)
12 Months Ended
Dec. 31, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]  
Summary of Changes to Prepaid Licensing and Royalty Fees

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

 

(in US$ thousands)

 

2019

 

 

2020

 

 

2021

 

Balance at beginning of year

 

$

435

 

 

$

44

 

 

$

130

 

Addition

 

 

205

 

 

 

340

 

 

 

98

 

Amortization and usage

 

 

(511

)

 

 

(254

)

 

 

(193

)

Impairment charges

 

 

(85

)

 

 

 

 

 

 

Balance at end of year

 

$

44

 

 

$

130

 

 

$

35