Liquidity (Details) - USD ($) $ in Thousands					12 Months Ended
	Jan. 25, 2018	Jan. 02, 2018	Oct. 24, 2017	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Jan. 31, 2018	Jun. 30, 2017	Dec. 31, 2015
Class of Stock [Line Items]
Cash					$ 3,946	$ 1,140		$ 1,100	$ 1,764
Working capital					3,088
Net income (loss)					5,785	(3,533)
Net cash provided by operating activities					1,609	183
Interest payments on indebtedness					878	1,116
Long-term debt					1,563	10,660		$ 11,500
Extinguishment of debt and accrued interest				$ 9,362
Principal payments under borrowing arrangements					605	400
Issuance of stock					$ 2,280	$ 204
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, cumulative dividend percentage rate, per annum			0.00%
Series B Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Issuance of stock (in shares)			2,800		2,800
Issuance of stock			$ 2,280
Subsequent Event
Class of Stock [Line Items]
Cash							$ 3,600
Long-term debt							$ 600
Principal payments under borrowing arrangements		$ 200
Subsequent Event | Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, cumulative dividend percentage rate, per annum	0.00%
Subsequent Event | Series C Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Issuance of stock (in shares)	1,750
Issuance of stock	$ 1,531