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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, 2018
Dec. 31, 2017
Number of shares    
Outstanding at beginning of period (in shares) 217,926  
Granted (in shares) 84,800  
Exercised (shares) 0  
Forfeited (in shares) (1,427)  
Expired (in shares) (1,832)  
Outstanding at end of period (in shares) 299,467 217,926
Exercisable at end of period (in shares) 162,760  
Weighted- average exercise price    
Outstanding at beginning of period (in dollars per share) $ 50.30  
Granted (in dollars per share) 2.99  
Exercised (in dollars per share) 0.00  
Forfeited (in dollars per share) 6.14  
Expired (in dollars per share) 57.41  
Outstanding at end of period (in dollars per share) 44.36 $ 50.30
Exercisable at end of period (in dollars per share) $ 74.69  
Additional disclosures    
Weighted-average remaining contractual term (in years), outstanding 7 years 6 months 7 years 3 months
Weighted-average remaining contractual term (in years), granted 9 years 9 months  
Weighted-average remaining contractual term (in years), exercisable 6 years 2 months  
Aggregate intrinsic value, outstanding $ 13 $ 0
Aggregate intrinsic value, exercisable $ 0