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Stock-Based Compensation (Schedule of Share Option Activity) (Details) - Stock Options [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Number of Options Outstanding    
Options outstanding at December 31, 2018 831,611  
Granted 1,550,270  
Cancelled/forfeited (115,864)  
Options outstanding at September 30, 2019 2,266,017 831,611
Unvested at September 30, 2019 1,613,280  
Vested and exercisable at September 30, 2019 652,737  
Weighted Average Exercise Price Per Share    
Options outstanding at December 31, 2018 $ 6.68  
Granted 0.71  
Cancelled / forfeited (in dollars per share) 2.03  
Options outstanding at September 30, 2019 2.84 $ 6.68
Unvested at September 30, 2019 1.27  
Vested and exercisable at September 30, 2019 $ 6.71  
Weighted Average Remaining Contractual Term (Years)    
Options outstanding 8 years 7 months 28 days 8 years 1 month 17 days
Unvested at September 30, 2019 8 years 10 months 24 days  
Vested and exercisable at September 30, 2019 8 years 29 days