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Stockholders' Equity (Common Stock Purchase Agreement) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 06, 2020 | Jun. 24, 2019 | May 17, 2018 | Dec. 28, 2019 | Dec. 29, 2018
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Shares issued |  |  | 5,405,405 |  | 31,786,146
Net purchase price |  |  |  |  | $ 15,762
Common Stock Purchase Agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Commitment shares | 1,529,052 | 818,420 |  |  |
Additional commitment shares |  |  |  | 523,633 |
Purchase Agreement Term | 36 months | 36 months |  |  |
Shares issued |  |  |  | 19,044,762 |
Net purchase price |  |  |  | $ 6,400 |
Threshold Percentage of Common Stock to be Sold | 9.99% |  |  | 9.99% |
Period After Purchase Agreement Not to Enter into Variable Rate Transaction | 36 months |  |  | 36 months |
Maximum | Common Stock Purchase Agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Aggregate amount | $ 20,000 | $ 10,000 |  |  |
Additional commitment shares | 917,431 | 818,420 |  |  |
Threshold Number of Shares of Common Stock to be Issued | 400,000 | 400,000 |  |  |
Threshold Value of Shares of Common Stock to be Issued Under Single Purchase | $ 1,000 | $ 1,000 |  |  |
Threshold Percentage of Number of Shares Issued Under Regular Purchase to Purchase Additional Amount of Common stock | 300.00% | 300.00% |  |  |
Threshold Percentage of Number of Shares of Common Stock to Purchase Additional Amount of Common stock | 30.00% | 30.00% |  |  |

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