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PREPAID LICENSING AND ROYALTY FEES | 12 Months Ended
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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 a t the end of 2022, 2021 and 2020, for the prepaid licensing and royalty fees.

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