Capital Stock (Details)				1 Months Ended			2 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2017 $ / shares shares	Jul. 07, 2017 USD ($) $ / shares shares	May 26, 2017 shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2016 shares	Oct. 31, 2015 USD ($)	Mar. 05, 2018 shares	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 27, 2017 shares	Sep. 12, 2017 $ / shares shares	Dec. 31, 2015 USD ($)
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	40,000,000		250,000,000	40,000,000					40,000,000	250,000,000	40,000,000
Proceeds from public stock offerings, net of issuance costs | $		$ 1,966,000							$ 13,318,000	$ 0
Issuance costs from private placement | $		$ 317,000		$ 1,171,000
Issuance of stock in connection with private placement (in shares)		570,784			27,500
Share price (in USD per share) | $ / shares		$ 4.00
Investment warrants, exercise price (in USD per share) | $ / shares		$ 5.04
Expected volatility rate									125.00%
Deemed dividend on Series A Convertible Preferred Stock issuance | $									$ 1,427,000	0
Net loss | $									(9,396,000)	(7,604,000)
Net loss applicable to common shareholders | $									(10,823,000)	$ (7,604,000)
Shares issued for each share converted			10
Stock issued during period, shares, reverse stock splits			28,700,000
Stock issued during period, shares, stock splits			2,900,000
Write off of deferred debt issuance cost | $									$ 622,000
Preferred stock, shares authorized	5,000,000			5,000,000					5,000,000	5,000,000
Preferred stock, par value per share (in dollars per share) | $ / shares	$ 0.01			$ 0.01					$ 0.01	$ 0.01
Preferred stock, shares outstanding	1,826			1,826					1,826	0
Aspire
Class of Stock [Line Items]
Common stock, commitment to sell, amount | $						$ 20,000,000							$ 20,000,000
Long-term purchase commitment, period						30 months
Common Stock
Class of Stock [Line Items]
Issuance of stock in connection with private placement (in shares)									4,667,000
Issuance of common stock upon conversion of preferred stock (in shares)									960,445	27,500
Common Stock | Aspire
Class of Stock [Line Items]
Issuance of stock in connection with private placement (in shares)									570,784
Series A Warrant
Class of Stock [Line Items]
Fair Value Assumptions, Expected Term				5 years
Risk free interest rate									2.20%
Series B Warrant
Class of Stock [Line Items]
Fair Value Assumptions, Expected Term				9 months
Risk free interest rate									1.70%
Consultant Offering
Class of Stock [Line Items]
Number of securities called by warrants (in shares)												30,000
Affiliated Entity
Class of Stock [Line Items]
Exercise price of warrants (in USD per share) | $ / shares												$ 2.90
Class A Units
Class of Stock [Line Items]
Issuance of stock in connection with private placement (in shares)				4,667,000
Share price (in USD per share) | $ / shares	$ 2.25			$ 2.25					$ 2.25
Class A Units | Series A Warrant
Class of Stock [Line Items]
Class of warrant or right expiration term				5 years
Exercise price of warrants (in USD per share) | $ / shares	$ 2.25			$ 2.25					$ 2.25
Number of securities called by each warrant or right	1			1					1
Class A Units | Series B Warrant
Class of Stock [Line Items]
Class of warrant or right expiration term				9 months
Exercise price of warrants (in USD per share) | $ / shares	$ 2.25			$ 2.25					$ 2.25
Number of securities called by each warrant or right	0.5			0.5					0.5
Class B Units
Class of Stock [Line Items]
Issuance of stock in connection with private placement (in shares)				3,987
Share price (in USD per share) | $ / shares	$ 1,000			$ 1,000					$ 1,000
Preferred Stock Conversions, Conversion Price | $ / shares	$ 2.25			$ 2.25					$ 2.25
Class B Units | Series A Warrant
Class of Stock [Line Items]
Class of warrant or right expiration term				5 years
Number of securities called by warrants (in shares)	445			445					445
Investment warrants, exercise price (in USD per share) | $ / shares				$ 2.25
Class B Units | Series B Warrant
Class of Stock [Line Items]
Class of warrant or right expiration term				9 months
Number of securities called by warrants (in shares)	223			223					223
Investment warrants, exercise price (in USD per share) | $ / shares				$ 2.25
Series A Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of stock, shares converted (in shares)	(2,161)
Preferred stock, redemption conditions, minimum market price per share (in USD per share) | $ / shares									$ 6.75
Preferred stock, redemption conditions, minimum daily market trading volume | $									$ 175,000
Preferred stock, shares outstanding	1,826			1,826					1,826
Scenario, Forecast
Class of Stock [Line Items]
Issuance costs from private placement | $								$ 221,000
Subsequent Event | Common Stock
Class of Stock [Line Items]
Issuance of common stock upon conversion of preferred stock (in shares)							763,556
Subsequent Event | Series A Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of stock, shares converted (in shares)							1,718