Capital Stock and Warrants (Details)						1 Months Ended		3 Months Ended	9 Months Ended
	Sep. 19, 2017 $ / shares shares	May 10, 2017 USD ($) $ / shares shares	Apr. 24, 2017	Nov. 22, 2016 USD ($) $ / shares shares	Jun. 03, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	May 31, 2017 USD ($)	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2017 shares	Apr. 30, 2017 $ / shares	Dec. 31, 2016 USD ($)	Nov. 30, 2016 shares
Class of Stock [Line Items]
Proceeds from exercises of warrants									$ 31,000
Conversion ratio of reverse stock split			10
Derivative liability						$ 400,000		$ 400,000	400,000			$ 2,443,000
Changes in estimated fair value									$ (1,997,000)
November 2016 Warrants [Member]
Class of Stock [Line Items]
Number of securities called by warrants | shares													533,500
Exercise price of warrants | $ / shares	$ 0.57					$ 0.57		$ 0.57	$ 0.57		$ 1.00
Warrants exercised during period | shares									53,333
Proceeds from exercises of warrants									$ 31,000
Derivative liability						$ 368,000		$ 368,000	368,000			$ 2,043,000
Changes in estimated fair value									(1,651,000)
Common Stock Issuance Agreement [Member]
Class of Stock [Line Items]
Shares issued per agreements | shares						523,210
Number of shares contingently issuable to Holders per CSIA | shares										523,210
CSIA Second Issuance [Member]
Class of Stock [Line Items]
Shares issued per agreements | shares	523,210					523,210
Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction | shares					212,766
Number of securities called by warrants | shares					106,383
Number of shares called by each warrant | shares					0.50
Sale of stock, price per share | $ / shares					$ 23.50
Proceeds from equity offerings, gross					$ 5,000,000
Exercise price of warrants | $ / shares					$ 22.50
Expiration term of warrants (in years)					5 years
Proceeds from issuance of common stock and warrants					$ 4,200,000
Derivative liability						$ 32,000		32,000	32,000
Changes in estimated fair value									(242,000)
Public Offering of Warrants and Common Stock [Member]
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction | shares		2,584,085		533,500
Number of securities called by warrants | shares				533,500
Number of shares called by each warrant | shares				1
Sale of stock, price per share | $ / shares				$ 7.50
Proceeds from equity offerings, gross				$ 4,000,000			$ 10,600,000
Exercise price of warrants | $ / shares				$ 7.50
Expiration term of warrants (in years)				5 years
Proceeds from issuance of common stock and warrants		$ 9,400,000		$ 3,300,000
Derivative liability						$ 368,000		368,000	368,000
Offering costs		$ 1,200,000
Changes in estimated fair value								$ 34,000	$ (1,651,000)
Public Offering of Warrants and Common Stock [Member] | Pre-Funded Warrant [Member]
Class of Stock [Line Items]
Number of securities called by warrants | shares		4,483,334
Number of shares called by each warrant | shares		1
Sale of stock, price per share | $ / shares		$ 1.49
Exercise price of warrants | $ / shares		$ 0.01
Public Offering of Warrants and Common Stock [Member] | Common Warrant [Member]
Class of Stock [Line Items]
Number of securities called by warrants | shares		8,000,000
Sale of stock, price per share | $ / shares		$ 1.50
Exercise price of warrants | $ / shares		$ 1.50
Expiration term of warrants (in years)		5 years