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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Number of shares    
Outstanding at beginning of period (in shares) 286,712  
Granted (in shares) 325,500  
Exercised (shares) 0  
Forfeited (in shares) 0  
Expired (in shares) (1,453)  
Outstanding at end of period (in shares) 610,759 286,712
Exercisable at end of period (in shares) 228,202  
Weighted- average exercise price    
Outstanding at beginning of period (in dollars per share) $ 46.01  
Granted (in dollars per share) 1.82  
Exercised (in dollars per share) 0.00  
Forfeited (in dollars per share) 0.00  
Expired (in dollars per share) 211.51  
Outstanding at end of period (in dollars per share) 22.07 $ 46.01
Exercisable at end of period (in dollars per share) $ 55.17  
Additional disclosures    
Weighted-average remaining contractual term (in years), outstanding 8 years 1 month 7 years
Weighted-average remaining contractual term (in years), granted 9 years 7 months  
Weighted-average remaining contractual term (in years), exercisable 5 years 10 months  
Aggregate intrinsic value, outstanding $ 390 $ 0
Aggregate intrinsic value, exercisable $ 11