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Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 29, 2019 | Aug. 27, 2018 | Sep. 28, 2019 | Sep. 28, 2019 | Sep. 29, 2018 | Nov. 18, 2015
Long-term debt |  |  |  |  |  |
Original issue discount |  |  |  |  | $ 170 |
Exercise price of warrants (in dollars per share) |  |  | $ 0.62 | $ 0.62 |  |
Debt issuance costs |  |  |  |  | 23 |
Proceeds from issuance of debt, net of $170 discount |  |  |  |  | $ 2,100 |
SVIC Warrant |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Number of shares which may be purchased under warrant |  |  |  |  |  | 2,000,000
Exercise price of warrants (in dollars per share) |  |  |  |  |  | $ 0.30
Fair value of warrants |  |  | $ 1,200 | $ 1,200 |  |
Senior Secured Convertible Note Due December 2025 [member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 15,000
Interest rate (as a percent) |  |  |  |  |  | 2.00%
Debt conversion price (in dollars per share) |  |  |  |  |  | $ 1.25
Debt, net of discounts and costs |  |  | 15,700 | 15,700 |  |
Unsecured Convertible Note Due August 2020 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Face amount |  | $ 2,300 |  |  |  |
Original issue discount |  | $ 200 |  | 200 |  |
Interest rate (as a percent) |  | 8.00% |  |  |  |
Debt conversion price (in dollars per share) |  | $ 0.36 |  |  |  |
Debt, net of discounts and costs |  | $ 1,000 |  |  |  |
Maximum Monthly Redemption Amount |  | $ 350 |  |  |  |
Lowest closing bid, percentage |  | 85.00% |  |  |  |
Redemption price floor, per share |  | $ 0.11 |  |  |  |
Maximum redemption amount honored |  | $ 150 |  |  |  |
Redemption conversion price |  | $ 0.06 |  |  |  |
Proceeds from Notes Payable |  |  |  | 2,100 |  |
Debt issuance, liability component |  |  | 1,900 | 1,900 |  |
Debt issuance, equity component |  | $ 200 |  |  |  |
Iliad Note [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Additional conversion of principal and accrued interest |  |  | $ 800 | $ 900 |  |
Additional conversion of shares |  |  | 3,247,000 | 3,624,074 |  |
Conversion of principal and accrued interest |  |  | $ 0 | $ 500 |  |
Conversion of shares |  |  |  | 1,388,890 |  |
Iliad Note [Member] | Subsequent Event |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Conversion of principal and accrued interest | $ 700 |  |  |  |  |
Conversion of shares | 2,905,873 |  |  |  |  |

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