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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Number of shares    
Outstanding at beginning of period (in shares) 286,712  
Granted (in shares) 310,500  
Exercised (shares) 0  
Forfeited (in shares) 0  
Expired (in shares) (385)  
Outstanding at end of period (in shares) 596,827 286,712
Exercisable at end of period (in shares) 223,805  
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) 18.05  
Outstanding at end of period (in dollars per share) 23.04 $ 46.01
Exercisable at end of period (in dollars per share) $ 57.36  
Additional disclosures    
Weighted-average remaining contractual term (in years), outstanding 8 years 3 months 7 years
Weighted-average remaining contractual term (in years), granted 9 years 11 months  
Weighted-average remaining contractual term (in years), exercisable 6 years  
Aggregate intrinsic value, outstanding $ 26 $ 0
Aggregate intrinsic value, exercisable $ 0