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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Non-U.S. income included in income (loss) before tax | $ 12,100,000 | $ 2,800,000 | $ 6,500,000
Current: |  |  |
State | 15,000 | 27,000 | 5,000
Foreign | 2,016,000 | 535,000 | 933,000
Total current | 2,031,000 | 562,000 | 938,000
Total provision for income taxes | $ 2,031,000 | $ 562,000 | $ 938,000
Reconciliation of effective income tax rates and U.S. statutory federal income tax rate [Abstract] |  |  |
Statutory federal income tax rate (as a percent) | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefits (as a percent) | 0.20% | (2.10%) |
Valuation allowance (as a percent) | 0.80% | (173.00%) | (2.60%)
Stock-based compensation (as a percent) | (1.90%) | (21.80%) | 0.30%
Foreign tax rate differential (as a percent) | 2.10% | 137.70% | (11.40%)
Foreign income tax incentive (as a percent) | (3.80%) | 32.20% | (2.90%)
Foreign tax incentives (as a percent) | 7.8 |  | 2.6
Tax effect in equity method loss or gain from unconsolidated affiliates (as a percent) | 1.10% | (47.80%) | 3.20%
Foreign-derived intangible income (as percent) |  |  | (2.40%)
Others (as a percent) | 1.40% | (1.00%) | 0.10%
Effective tax rate (as a percent) | 28.70% | (54.80%) | 7.90%
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 14,328,000 | $ 14,979,000 |
Accruals, reserves and other | 3,756,000 | 3,011,000 |
Credit carryforwards | 1,685,000 | 1,685,000 |
Operating lease liability | 178,000 | 209,000 |
Gross deferred tax assets | 19,947,000 | 19,884,000 |
Valuation allowance | (19,798,000) | (19,691,000) |
Total deferred tax assets | 149,000 | 193,000 |
Deferred tax liabilities: |  |  |
Operating lease right-of-use assets | (149,000) | (193,000) |
Increase (decrease) in valuation allowance | $ 100,000 | 200,000 | $ (2,600,000)
Realized benefits of tax rate reduction (as a percent) | 10.00% |  |
Unrecognized tax benefit would favorably impact the effective tax rate in future periods if recognized | $ 14,600,000 | 14,600,000 |
Domestic Tax Authority |  |  |
Deferred tax liabilities: |  |  |
Operating loss carryforwards | 57,000,000.0 |  |
Tax credit carryforwards | $ 800,000 |  |
Foreign Tax Authority |  |  |
Deferred tax liabilities: |  |  |
EIT income tax rate (as a percent) | 25.00% |  |
Preferential tax rate (as a percent) | 15.00% |  |
Benefit from foreign tax rate | $ 973,000 | $ 211,000 | $ 764,000

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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