XML 26 R10.htm IDEA: XBRL DOCUMENT
v3.21.1

PREPAID LICENSING AND ROYALTY FEES | 12 Months Ended
--- | ---
Dec. 31, 2020
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) |  | 2018 |  |  | 2019 |  |  | 2020 |
Balance at beginning of year |  | $ | 459 |  |  | $ | 435 |  |  | $ | 44 |
Addition |  |  | 968 |  |  |  | 205 |  |  |  | 340 |
Amortization and usage |  |  | (747 | ) |  |  | (511 | ) |  |  | (254 | )
Exchange difference |  |  | (1 | ) |  |  | — |  |  |  | — |
Impairment charges (Note 4) |  |  | (244 | ) |  |  | (85 | ) |  |  | — |
Balance at end of year |  | $ | 435 |  |  | $ | 44 |  |  | $ | 130 |
At the end of 2018, 2019 and 2020, we recognized impairment losses of $244 thousand, $85 thousand and $0, respectively, for the prepaid licensing and royalty fees related to certain licensed games that we stopped operating or for which the carrying amounts of the related assets were determined not to be recoverable from their expected future undiscounted cash flows.

X
- Definition Prepaid expense noncurrent. + References No definition available. + Details
Name: | gigm_PrepaidExpenseNoncurrentTextBlock
Namespace Prefix: | gigm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration