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Prepaids and Other Current Assets - Additional Information (Details) - USD ($) $ in Thousands | Nov. 08, 2016 | Sep. 28, 2019 | Dec. 29, 2018
--- | --- | --- | ---
Short Term Debt [Line Items] |  |  |
Short term debt |  | $ 791 | $ 675
Energy Efficiency Investments LLC Securities Purchase Agreement | Notes Payable |  |  |
Short Term Debt [Line Items] |  |  |
Debt issuance date | Nov. 08, 2016 |  |
Debt face amount | $ 7,732 |  |
Debt interest rate | 3.00% |  |
Debt interest accrual rate | 8.00% |  |
Short term debt |  | 0 | 0
Unamortized debt issuance costs | $ 740 | $ 308 | $ 419
Debt issuance costs amortization period | 60 months |  |

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