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MARKETABLE SECURITIES - NONCURRENT (Tables) | 12 Months Ended
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Dec. 31, 2021
Marketable Securities [Abstract] |
Summary of Marketable Securities Noncurrent | Marketable securities – noncurrent consist of the following:
|  | December 31 |
(in US$ thousands) |  | 2020 |  |  | 2021 |
Debt securities, classified as available-for-sale |  | $ | 10,000 |  |  | $ | 8,132 |
Equity securities |  |  | — |  |  |  | 2,190 |
|  | $ | 10,000 |  |  | $ | 10,322 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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