Liquidity (Details)					3 Months Ended		9 Months Ended
	Oct. 14, 2016 USD ($) $ / shares shares	Sep. 15, 2016 USD ($) $ / shares shares	Mar. 28, 2016 USD ($) $ / shares shares	Jan. 25, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) operating_lease $ / shares	Sep. 30, 2015 USD ($)	Nov. 10, 2016 USD ($)	Jun. 15, 2016 $ / shares	Dec. 31, 2015 USD ($) $ / shares	Apr. 17, 2015 shares	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Loss from continuing operations					$ (2,051,000)	$ (2,061,000)	$ (7,630,000)	$ (7,506,000)
Net cash used in operating activities of continuing operations							$ 7,081,000	6,896,000
Issuance of common stock and warrants, net of issuance costs			$ 1,200,000	$ 3,400,000
Stock issued (in shares) | shares			666,667	2,601,789
Common stock, par value (in dollars per share) | $ / shares			$ 0.04	$ 0.04	$ 0.04		$ 0.04			$ 0.04	$ 0.04
Cash and cash equivalents					$ 825,000	$ 1,528,000	$ 825,000	$ 1,528,000			$ 2,035,000		$ 5,201,000
Number of operating lease contracts in default | operating_lease							3
Line of credit | 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Borrowings outstanding					4,800,000		$ 4,800,000
Available borrowing availability					$ 1,100,000		$ 1,100,000
Loans payable | Credit agreement
Debt Instrument [Line Items]
Common stock, par value (in dollars per share) | $ / shares			$ 0.04
Number of shares to be purchased under warrant (in shares) | shares												543,478
Exercise price of warrant (in dollars per share) | $ / shares					$ 1.30		$ 1.30
Value of stock issued			$ 100,000
Outstanding borrowings under term loan					$ 4,000,000		$ 4,000,000
Subsequent event
Debt Instrument [Line Items]
Number of shares to be purchased under warrant (in shares) | shares	55,556
Subsequent event | Line of credit | 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Borrowings outstanding									$ 5,300,000
Available borrowing availability									$ 1,700,000
Private Offering Warrants
Debt Instrument [Line Items]
Issuance of common stock and warrants, net of issuance costs		$ 1,600,000
Stock issued (in shares) | shares		1,333,333
Common stock, par value (in dollars per share) | $ / shares		$ 0.04
Private Offering Warrants | Subsequent event
Debt Instrument [Line Items]
Stock issued (in shares) | shares	55,556
Common stock, par value (in dollars per share) | $ / shares	$ 0.04
Share price, minimum (in dollars per share) | $ / shares	$ 3.00
Consecutive trading days of stocks	10 days
Minimum trading volume (in shares) | $ / shares	$ 100,000
Private Offering
Debt Instrument [Line Items]
Number of shares to be purchased under warrant (in shares) | shares		1,333,333
Exercise price of warrant (in dollars per share) | $ / shares		$ 2.00
Private Offering | Subsequent event
Debt Instrument [Line Items]
Exercise price of warrant (in dollars per share) | $ / shares	$ 2.00
Value of stock issued	$ 100,000