Stockholders' Equity (Deficit) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Class of Warrant or Right
Outstanding	2,112
Class of Warrant or Right Issued Date One [Member]
Class of Warrant or Right
Date Issued	Apr. 13, 2012
Expiration Date	Apr. 13, 2018
Exercise Price (in dollars per share) \| $ / shares	$ 4.85
Outstanding	983
Class of Warrant or Right Issued Date Two [Member]
Class of Warrant or Right
Date Issued	Oct. 08, 2014
Expiration Date	Oct. 08, 2020
Exercise Price (in dollars per share) \| $ / shares	$ 3.3
Outstanding	848
Class of Warrant or Right Issued Date Three [Member]
Class of Warrant or Right
Date Issued	Jul. 27, 2017
Expiration Date	Jul. 27, 2024
Exercise Price (in dollars per share) \| $ / shares	$ 1.96
Outstanding	281