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Note 7 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | $ |  |  | $ |  |  | $ |
Cayman Islands |  |  | 5,652 |  |  |  | 3,522 |  |  |  | 2,100 |
U.S. |  |  | 34,318 |  |  |  | 13,144 |  |  |  | 8,305 |
PRC |  |  | 6,368 |  |  |  | 7,253 |  |  |  | 2,674 |
BVI |  |  | 18,336 |  |  |  | 12,831 |  |  |  | 8,757 |
Australia |  |  | (36 | ) |  |  | (633 | ) |  |  | 6 |
Loss before income tax |  |  | 64,638 |  |  |  | 36,117 |  |  |  | 21,842 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | $ |  |  | $ |  |  | $ |
Current income tax |  |  | 3,570 |  |  |  | 163 |  |  |  | 106 |
Deferred income tax |  |  | - |  |  |  | - |  |  |  | - |
Income tax expenses |  |  | 3,570 |  |  |  | 163 |  |  |  | 106 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | $ |  |  | $ |  |  | $ |
Loss before income tax |  |  | 64,638 |  |  |  | 36,117 |  |  |  | 21,842 |
Expected income tax benefit |  |  | 13,574 |  |  |  | 7,585 |  |  |  | 4,566 |
Tax rate difference |  |  | (3,796 | ) |  |  | (2,253 | ) |  |  | (1,800 | )
Non-deductible expenses |  |  | (788 | ) |  |  | 812 |  |  |  | 20 |
Research tax credits |  |  | 1,096 |  |  |  | 1,437 |  |  |  | 359 |
Non-taxable income |  |  | 21 |  |  |  | - |  |  |  | - |
Tax preference |  |  | 3,755 |  |  |  | (667 | ) |  |  | (336 | )
Others |  |  | (262 | ) |  |  | (216 | ) |  |  | 389 |
Current and deferred tax rate differences |  |  | - |  |  |  | 672 |  |  |  | 383 |
Stock Compensation Expense - Windfall |  |  | - |  |  |  | - |  |  |  | (807 | )
R&D super deduction |  |  | - |  |  |  | 389 |  |  |  | 409 |
Interest expenses |  |  | - |  |  |  | (315 | ) |  |  | (523 | )
Change in valuation allowance |  |  | (17,170 | ) |  |  | (7,607 | ) |  |  | (2,766 | )
Total income tax (expenses) |  |  | (3,570 | ) |  |  | (163 | ) |  |  | (106 | )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2023 |
|  | $ |  |  | $ |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforward |  |  | 26,571 |  |  |  | 28,325 |
Deferral of tax deduction of R&D expenses |  |  | 6,857 |  |  |  | 6,820 |
Mandatory R&D Capitalization |  |  | 3,819 |  |  |  | 5,602 |
Share-based compensation |  |  | 1,591 |  |  |  | 1,687 |
Deferred Incentive Compensation |  |  | - |  |  |  | 24 |
Deferred revenue |  |  | 8,630 |  |  |  | 7,699 |
Research tax credits |  |  | 5,295 |  |  |  | 5,698 |
Operating lease liabilities |  |  | 1,043 |  |  |  | 841 |
Accruals and reserves |  |  | 21 |  |  |  | 400 |
Total deferred tax assets |  |  | 53,827 |  |  |  | 57,096 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Unrealized gain |  |  | (41 | ) |  |  | (46 | )
Depreciation |  |  | (346 | ) |  |  | (345 | )
Operating lease right-of-use assets |  |  | (1,153 | ) |  |  | (925 | )
Total deferred tax liabilities |  |  | (1,540 | ) |  |  | (1,316 | )
Total gross deferred tax assets |  |  | 52,287 |  |  |  | 55,780 |
Less: valuation allowance |  |  | (52,287 | ) |  |  | (55,780 | )
Net deferred tax assets |  |  | - |  |  |  | - |
Summary of Income Tax Contingencies [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | $ |  |  | $ |  |  | $ |
Beginning balance, as of January 1 |  |  | 730 |  |  |  | 1,065 |  |  |  | 3,634 |
Additions based on tax positions related to prior tax years |  |  | 283 |  |  |  | 3,099 |  |  |  | - |
Reductions based on tax positions related to prior tax years |  |  | - |  |  |  | (608 | ) |  |  | (440 | )
Additions based on tax positions related to current tax year |  |  | 52 |  |  |  | 78 |  |  |  | - |
Ending balance, as of December 31 |  |  |  |  |  |  |  |  |  |  |  |
|  |  | 1,065 |  |  |  | 3,634 |  |  |  | 3,194 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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