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PREPAID LICENSING AND ROYALTY FEES (Tables)
12 Months Ended
Dec. 31, 2019
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)

 

2017

 

 

2018

 

 

2019

 

Balance at beginning of year

 

$

1,020

 

 

$

459

 

 

$

435

 

Addition

 

 

486

 

 

 

968

 

 

 

205

 

Amortization and usage

 

 

(1,040

)

 

 

(747

)

 

 

(511

)

Exchange difference

 

 

(7

)

 

 

(1

)

 

 

 

Impairment charges (Note 4)

 

 

 

 

 

(244

)

 

 

(85

)

Balance at end of year

 

$

459

 

 

$

435

 

 

$

44