Debt - Super G Loan Agreement and Warrant (Details) - USD ($)				12 Months Ended
	Jan. 26, 2018	Jan. 02, 2018	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Proceeds from issuance of debt			$ 2,200,000
Repayments of Long-term Debt				$ 605,000	$ 400,000
Cash paid during the period for interest				878,000	1,116,000
Long-term debt				1,832,000
Debt instrument, unamortized discount				269,000	125,000
Super G Loan
Debt Instrument [Line Items]
Proceeds from issuance of debt			1,100,000
Debt periodic payment one through three			33,000
Debt periodic payment four through twenty-four			68,600
Debt periodic payment			$ 1,540,000
Effective interest rate			33.00%
Repayments of Long-term Debt				68,000
Cash paid during the period for interest				134,000
Long-term debt				1,032,000	0
Warrant outstanding			550,000
Exercise price of warrants (in dollars per share)			$ 0.30
Warrant term			3 years
Warrant profit over the term or cash exit fee implemented			$ 165,000
Fair value adjustment of warrants				0
Western Alliance Bank And Super G Capital
Debt Instrument [Line Items]
Debt instrument, unamortized discount			$ 339,000
Amortization of debt discount				70,000
Promissory Note | SRS Note
Debt Instrument [Line Items]
Long-term debt				0	$ 1,785,000
Amortization of debt discount				$ 36,000
Warrants
Debt Instrument [Line Items]
Warrants exercised (in shares)				0
Warrants | Super G Loan
Debt Instrument [Line Items]
Derivative liability				$ 165,000
Subsequent Event
Debt Instrument [Line Items]
Repayments of Long-term Debt		$ 200,000
Subsequent Event | Super G Loan
Debt Instrument [Line Items]
Repayments of debt	$ 1,269,000