Stockholders' Equity (Details) - USD ($)						3 Months Ended
	Apr. 02, 2018	Jan. 02, 2018	Oct. 02, 2017	Jul. 03, 2017	Apr. 03, 2017	Mar. 31, 2018	Mar. 05, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Common Stock, Shares, Issued						32,560,000	200,000	31,156,000
Common Stock, Value, Issued, Net							$ 4,700,000
Common Stock, Value, Issued, Expenses							$ 1,350,000
Retained Earnings (Accumulated Deficit)						$ (322,029,000)		$ (301,032,000)
Number of shares that may be purchased by warrants (shares)							60,000
Exercise price of right (usd per right)							$ 81.50
Class of Warrant or Right, Amortization Period						7 years
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Class of Stock [Line Items]
Retained Earnings (Accumulated Deficit)						$ (54,000)
Series B
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding						44,000		44,000
Dividends, Preferred Stock, Cash		$ 32,087	$ 32,087	$ 32,087	$ 32,087
Series B | Subsequent Event
Class of Stock [Line Items]
Dividends, Preferred Stock, Cash	$ 32,087