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Stockholders' Equity (Common Stock Purchase Agreement) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 29, 2019 | Jun. 24, 2019 | Apr. 16, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 28, 2019
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |  |  |  |
Term agreement |  |  | 2 years |  |  |  |  |
Net purchase price |  |  |  | $ 2,457 | $ 11,152 | $ 2,818 | $ 1,794 |
Class of Warrant or Right, Outstanding |  |  |  | 15,010,012 |  |  |  | 15,010,012
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 0.62 |  |  |  | $ 0.62
Common Stock Purchase Agreement |  |  |  |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |  |  |  |
Commitment shares |  | 818,420 |  |  |  |  |  |
Repurchased shares |  |  |  | 8,189,364 |  |  |  | 8,189,364
Repurchase of common stock price |  |  |  | $ 2,500 |  |  |  | $ 2,500
Stock issued common stock |  |  |  |  |  |  |  | 204,771
Purchase Agreement Term |  | 36 months |  |  |  |  |  |
Subsequent Event | Common Stock Purchase Agreement |  |  |  |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |  |  |  |
Additional commitment shares | 283,506 |  |  |  |  |  |  |
Shares issued | 9,655,398 |  |  |  |  |  |  |
Net purchase price | $ 3,500 |  |  |  |  |  |  |
Threshold Percentage of Common Stock to be Sold | 9.99% |  |  |  |  |  |  |
Period After Purchase Agreement Not to Enter into Variable Rate Transaction | 36 months |  |  |  |  |  |  |
Terminated Agreement Cost | $ 0 |  |  |  |  |  |  |
Maximum | Common Stock Purchase Agreement |  |  |  |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |  |  |  |
Aggregate amount |  | $ 10,000 |  |  |  |  |  |
Additional commitment shares |  | 818,420 |  |  |  |  |  |
Threshold Number of Shares of Common Stock to be Issued |  | 400,000 |  |  |  |  |  |
Threshold Value of Shares of Common Stock to be Issued Under Single Purchase |  | $ 1,000 |  |  |  |  |  |
Threshold Percentage of Number of Shares Issued Under Regular Purchase to Purchase Additional Amount of Common stock |  | 300.00% |  |  |  |  |  |
Threshold Percentage of Number of Shares of Common Stock to Purchase Additional Amount of Common stock |  | 30.00% |  |  |  |  |  |

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