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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Jan. 03, 2020 | Dec. 28, 2018 | Dec. 29, 2017
Income Taxes [Line Items] |  |  |
Income Tax Expense (Benefit) | $ (1,022,000) | $ 1,671,000 | $ (157,000)
Increase (Decrease) Deferred Tax Assets Valuation Allowance | (5,472,000) | 2,418,000 | (16,789,000)
Increase (Decrease) In Foreign Deferred Tax Liabilities | (46,000) | 36,000 | (47,000)
Income tax reconciliation of global intangible low-taxed income | $ 16,100,000 | 7,700,000 |
Percentage of deduction in GILTI | 50.00% |  |
Deferred Tax Assets, Net | $ 3,750,000 | 256,000 |
Taxes Payable | 2,572,000 | 820,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 136,000 |  |
Operating Loss Carryforwards | $ 129,000,000 |  |
Operating Loss Carry Forwards Expiration Term | expire in varying amounts between 2020 and 2037 |  |
Operating Loss Carryforwards, Limitations on Use | The California net operating loss carryforwards expire in varying amounts between 2028 and 2039 |  |
Stock-based compensation | $ 3,455,000 | 2,489,000 |
STAAR Surgical AG |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Liabilities, Net | 658,000 | 922,000 |
Swiss |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Liabilities, Net | 658,000 | 922,000 |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 1,295,000 | 1,282,000 |
JAPAN |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Net | 896,000 | 905,000 |
Stock-based compensation | 46,000 | 44,000 |
US |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Net | 3,139,000 | 273,000 |
California |  |  |
Income Taxes [Line Items] |  |  |
Operating Loss Carryforwards | 33,000,000 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) Deferred Tax Assets | 387,000 |  |
Increase (Decrease) Deferred Tax Assets Valuation Allowance | (760,000) | $ 447,000 | $ (646,000)
Deferred Tax Assets, Net | 373,000 |  |
Deferred tax assets, valuation allowance | 6,643,000 |  |
Federal and State |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Net | 3,512,000 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Net | 3,003,000 |  |
Deferred tax assets, valuation allowance | 33,813,000 |  |
Deferred tax asset, in foreign tax credits and foreign withholding taxes | $ 2,285,000 |  |

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