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Shareholders' Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018 | Dec. 30, 2017
Shareholders Equity [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  | 10,000,000 |  | 10,000,000 |
Stock issued new during period, shares |  | 223,214 |  |  |
Common stock, issued shares (in shares) |  | 1,917,779 |  | 1,694,565 |
Common stock, outstanding shares (in shares) |  | 1,917,779 |  | 1,694,565 |
Options outstanding |  | 44,400,000 |  | 100,900,000 | 125,500,000
Options granted |  | 0 | 0 |  |
Share-based compensation expense |  | $ 712,000 | $ 596,000 |  |
Estimated future share-based compensation expense |  | 554,000 |  |  |
Estimated future share-based compensation expense per month |  | $ 51,000 |  |  |
Warrants outstanding |  | 33,000 |  | 33,000 |
Warrant exercise price |  | $ 3.40 |  | $ 3.40 |
Warrant expiration date |  | May 31, 2020 |  |  |
Preferred stock, shares authorized (in shares) |  | 2,000,000 |  | 2,000,000 |
Conversion of stock, description |  | On June 21, 2019, the shares of Series A Preferred Stock were exchanged for shares of Series A-1 Preferred Stock on a one-for-one basis. |  |  |
Series A Convertible Preferred Stock | GeoTraq Inc. |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |
Stock issued in acquisition | 288,588 |  |  |  |
Stock Options |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 0 | $ 0 |  |
Closing stock price used in pre-tax intrinsic value |  | $ 2.90 |  |  |
In-the-money options exercisable (in shares) |  | 0 |  | 0 |
2016 Plan |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |
Options expiration date |  | Oct. 28, 2026 |  |  |
Options authorized for issuance |  | 400,000,000 |  |  |
Options outstanding |  | 4,000,000 |  | 4,000,000 |
2016 Plan | Employees |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |
Options granted, vesting period |  | 2 years |  |  |
2016 Plan | Non-Employee Directors |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |
Options granted, vesting period |  | 6 months |  |  |
2011 Plan |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |
Options expiration date |  | May 12, 2021 |  |  |
Options outstanding |  | 40,400,000 |  | 97,000,000 |
Additional awards to be granted after adoption of 2016 plan |  | 0 |  |  |
Articles of Incorporation |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  | 10,000,000 |  |  |

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