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Short Term Debt - Summary of Short Term Debt and Other Financing Obligations (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 28, 2019
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Short Term Debt [Line Items] |  |
Total short term debt | $ 3,327 | $ 280
AFCO Finance |  |
Short Term Debt [Line Items] |  |
Total short term debt | 287 | 155
GE 8% Loan Agreement |  |
Short Term Debt [Line Items] |  |
Total short term debt |  | $ 125
Payroll Protection Program |  |
Short Term Debt [Line Items] |  |
Total short term debt | 1,872 |
Vendor advance payments |  |
Short Term Debt [Line Items] |  |
Total short term debt | $ 1,168 |

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