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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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