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Warrants (Changes in Fair Value of Warrant Liability) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance $ 1,860
Fair Value of Warrants Granted 10,357
Fair Value Of Warrants Exercised 0
Change in fair value of warrants (3,707)
Warrant liability, Ending balance 8,510
February 2017  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 0
Fair Value of Warrants Granted 10,357
Fair Value Of Warrants Exercised 0
Change in fair value of warrants (2,345)
Warrant liability, Ending balance 8,012
July 2016  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 753
Fair Value of Warrants Granted 0
Fair Value Of Warrants Exercised 0
Change in fair value of warrants (540)
Warrant liability, Ending balance 213
January 2016  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 529
Fair Value of Warrants Granted 0
Fair Value Of Warrants Exercised 0
Change in fair value of warrants (375)
Warrant liability, Ending balance 154
March 2015  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 432
Fair Value of Warrants Granted 0
Fair Value Of Warrants Exercised 0
Change in fair value of warrants (301)
Warrant liability, Ending balance 131
September 2013  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 81
Fair Value of Warrants Granted 0
Fair Value Of Warrants Exercised 0
Change in fair value of warrants (81)
Warrant liability, Ending balance 0
December 2012  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 65
Fair Value of Warrants Granted 0
Fair Value Of Warrants Exercised 0
Change in fair value of warrants (65)
Warrant liability, Ending balance 0
April 2011  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 0
Fair Value of Warrants Granted 0
Fair Value Of Warrants Exercised 0
Change in fair value of warrants 0
Warrant liability, Ending balance $ 0