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Common Stock Warrant Liability (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Feb. 28, 2018
Jan. 25, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]          
Equity offering and private placement close date   2018-02      
Number of shares of common stock called by warrants       3,922,842  
Number of shares of common stock called by each warrant       0.4  
Warrants exercise price per share       $ 1.55  
Fair value of warrant liability $ 3,303 $ 3,303     $ 784
Change in fair value of common stock warrant liability $ 1,311 $ 387      
Equity Offering and Private Placement [Member]          
Class of Warrant or Right [Line Items]          
Number of shares of common stock called by warrants       4,004,324  
Warrants exercise price per share       $ 1.55  
Warrants outstanding 3,974,324 3,974,324      
Fair value of warrant liability $ 2,700 $ 2,700 $ 2,900    
2017 Offering [Member]          
Class of Warrant or Right [Line Items]          
Fair value of warrant liability $ 600 $ 600     $ 800