Capital Stock and Warrants (Details)					1 Months Ended	3 Months Ended	6 Months Ended
	May 10, 2017 USD ($) $ / shares shares	Apr. 24, 2017	Nov. 22, 2016 USD ($) $ / shares shares	Jun. 03, 2016 USD ($) $ / shares shares	May 31, 2017 USD ($)	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Jun. 30, 2016 shares
Class of Stock [Line Items]
Derivative liability | $						$ 387,000	$ 387,000	$ 2,443,000
Changes in estimated fair value | $							$ (2,034,000)
Conversion ratio of reverse stock split		10
Common Stock Issuance Agreement [Member]
Class of Stock [Line Items]
Number of shares contingently issuable to Holders per CSIA | shares						523,210	523,210		523,210
Pre-Funded Warrant [Member]
Class of Stock [Line Items]
Exercise price of warrants | $ / shares						$ 0.01	$ 0.01
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 | $						$ 29,000	$ 29,000
Changes in estimated fair value | $							(245,000)
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 | $	$ 9,000,000		$ 3,300,000
Derivative liability | $						$ 358,000	358,000
Offering costs | $	$ 1,600,000
Changes in estimated fair value | $							$ (1,685,000)
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
Warrants exercised during period | shares						4,283,434
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