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Related Parties (Details) $ / shares in Units, $ in Thousands							1 Months Ended	9 Months Ended
	May 23, 2018 shares	Mar. 30, 2018 USD ($) $ / shares shares	Sep. 14, 2017 shares	Jun. 06, 2017 shares $ / shares	Jun. 22, 2015 USD ($) shares $ / shares	Jul. 21, 2014 USD ($) shares $ / shares	Jul. 31, 2018 shares	Sep. 30, 2018 USD ($) shares Director $ / shares	Sep. 30, 2017 USD ($) shares	Sep. 13, 2017 USD ($)
Related Party Transaction [Abstract]
Sale of common stock, net of expenses \| $								$ 14,664
Sale of common stock, net of expenses (in shares)	15,740,741						153,004
Number of directors \| Director								2
Related party expense \| $								$ 13
Series C Convertible Preferred Stock [Member]
Related Party Transaction [Abstract]
Aggregate principal amount of debt \| $										$ 40,465
Senior Secured 2.25% Convertible Debentures [Member]
Related Party Transaction [Abstract]
Aggregate principal amount of debt \| $								$ 32,500
Number of shares debt convertible (in shares)								8,666,668
Initial conversion price (in dollars per share) \| $ / shares								$ 3.75
Interest rate								2.25%
Maturity period								5 years
Maturity date								Jun. 30, 2021
Senior Secured 4% Convertible Debentures [Member]
Related Party Transaction [Abstract]
Aggregate principal amount of debt \| $						$ 15,000		$ 15,000
Number of shares debt convertible (in shares)						1,169,595
Initial conversion price (in dollars per share) \| $ / shares						$ 12.825
Interest rate				4.00%				4.00%
Maturity period								5 years
Maturity date								Jul. 30, 2021
Debt conversion, converted instrument, issued (in shares)									70,000
Senior Secured 2.25% Convertible Debentures and Senior Secured 4% Convertible Debentures [Member] \| Series C Convertible Preferred Stock [Member]
Related Party Transaction [Abstract]
Number of shares debt convertible (in shares)				15,049,000
Initial conversion price (in dollars per share) \| $ / shares				$ 2.69
Debt conversion, converted instrument, issued (in shares)			40,482
Sabby Management LLC and Broadfin LLC [Member]
Related Party Transaction [Abstract]
Number of shares underlying warrants (in shares)					600,000
Exercise price of warrants (in dollars per share) \| $ / shares					$ 3.75
Sabby Management LLC and Broadfin LLC [Member] \| Senior Secured 2.25% Convertible Debentures [Member]
Related Party Transaction [Abstract]
Exercise price of warrants (in dollars per share) \| $ / shares					$ 3.75
Aggregate principal amount of debt \| $					$ 32,500
Number of shares debt convertible (in shares)					8,666,668
Initial conversion price (in dollars per share) \| $ / shares					$ 3.75
Interest rate					2.25%
Maturity period								5 years
Maturity date								Jun. 30, 2021
Two Board Directors [Member]
Related Party Transaction [Abstract]
Monthly retainer fee \| $									$ 10
Broadfin Capital and Sabby Management Stock Purchase Agreements [Member] \| Broadfin Capital [Member]
Related Party Transaction [Abstract]
Sale of common stock, net of expenses \| $		$ 1,000
Sale of common stock, net of expenses (in shares)		925,926
Share price (in dollars per share) \| $ / shares		$ 1.08
Broadfin Capital and Sabby Management Stock Purchase Agreements [Member] \| Sabby Management LLC and Broadfin LLC [Member]
Related Party Transaction [Abstract]
Sale of common stock, net of expenses \| $		$ 1,000
Sale of common stock, net of expenses (in shares)		925,926
Share price (in dollars per share) \| $ / shares		$ 1.08
Subscription Agreement [Member] \| Dr. Dolev Rafaeli [Member]
Related Party Transaction [Abstract]
Sale of common stock, net of expenses \| $		$ 1,000
Sale of common stock, net of expenses (in shares)		925,926
Share price (in dollars per share) \| $ / shares		$ 1.08