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OMM Debt (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 02, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Disclosure [Abstract] |  |  |
Secured Debt, Current |  | $ 1,121,000 | $ 0
Short-term Debt, Percentage Bearing Fixed Interest Rate |  | 1.68% |
Debt Instrument, Maturity Date |  | Dec. 30, 2020 |
Extinguishment of Debt, Amount |  | $ 594,000 |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Maturity Date |  | Dec. 30, 2020 |
Subsequent Event [Member] |  |  |
Debt Disclosure [Abstract] |  |  |
Debt Instrument, Maturity Date | Jun. 24, 2021 |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Fee | If the OMM Note is not paid in full, including the extension fee, on the Extension Date an additional fee of $472,000 is due and payable on demand. |  |
Debt Instrument, Maturity Date | Jun. 24, 2021 |  |
Debt Instrument, Fee Amount | $ 118,000 |  |

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