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Warrants (Changes in Fair Value of Warrant Liability) (Details) $ in Thousands | 6 Months Ended
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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

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