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v3.20.1

Description of Business (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2020 USD ($) | Jun. 24, 2019 USD ($) | Sep. 12, 2018 USD ($) $ / shares shares | Aug. 29, 2018 USD ($) shares | Aug. 27, 2018 USD ($) | May 17, 2018 USD ($) $ / shares shares | Nov. 14, 2017 USD ($) | Dec. 28, 2019 USD ($) segment $ / shares shares | Dec. 29, 2018 USD ($) shares | Apr. 17, 2017 $ / shares
Number of reportable segment | segment |  |  |  |  |  |  |  | 1 |  |
Net loss |  |  |  |  |  |  |  | $ (12,452) | $ (17,120) |
Common stock shares issued | shares |  |  |  |  |  | 5,405,405 |  |  | 31,786,146 |
Net purchase price |  |  |  |  |  |  |  |  | $ 15,762 |
Share purchase price | $ / shares |  |  |  |  |  | $ 0.148 |  |  |  | $ 6.56
Proceeds from issuance of common stock, net |  |  |  |  |  | $ 800 |  | $ 6,352 | 15,762 |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.62 |  |
Original issue discount |  |  |  |  |  |  |  | $ 170 | 170 |
Outstanding principal and accrued interest |  |  |  |  |  |  |  | $ 412 | 376 |
Maximum |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.25 |  |
Securities purchase agreement |  |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  |  | 22,222,220 |  |  |  |  |  |  |
Share purchase price | $ / shares |  |  | $ 0.45 |  |  |  |  |  |  |
Proceeds from issuance of common stock, net |  |  | $ 9,200 |  |  |  |  |  |  |
Warrants issued to purchase additional shares | shares |  |  | 11,111,110 |  |  |  |  |  |  |
Warrants exercisable (in days) |  |  | 181 days |  |  |  |  |  |  |
Warrants term |  |  | 5 years |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  | $ 0.655 |  |  |  |  |  |  |
Common Stock Purchase Agreement |  |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  |  |  |  |  |  |  | 19,044,762 |  |
Net purchase price |  |  |  |  |  |  |  | $ 6,400 |  |
Purchase Agreement Term | 36 months | 36 months |  |  |  |  |  |  |  |
Common Stock Purchase Agreement | Maximum |  |  |  |  |  |  |  |  |  |
Issuance of commitment shares | $ 20,000 | $ 10,000 |  |  |  |  |  |  |  |
2020 Purchase Agreement |  |  |  |  |  |  |  |  |  |
Issuance of commitment shares | $ 20,000 |  |  |  |  |  |  |  |  |
Purchase Agreement Term | 36 months |  |  |  |  |  |  |  |  |
Unsecured Convertible Note Due August 2020 |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 2,300 |  |  |  |  |
Original issue discount |  |  |  |  | $ 200 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 8.00% |  |  |  |  |
Outstanding principal and accrued interest |  |  |  |  |  |  |  | $ 0 | $ 2,300 |
ATM Program |  |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  |  |  | 40,680,368 |  |  |  |  |  |
Proceeds from issuance of common stock, net |  |  |  | $ 8,600 |  |  |  |  |  |
Aggregate gross proceeds agent can sell shares of stock |  |  |  |  |  |  | $ 9,000 |  |  |

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