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Share-Based Compensation - 2016 Employee Stock Purchase Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Apr. 30, 2016
Apr. 30, 2015
2016 Employee Stock Purchase Plan            
Expected stock price volatility 66.30% 65.80% 71.447%      
Expected life of options (years) 5 years 9 months 18 days 5 years 10 months 24 days 6 years 7 days      
Expected dividend yield 0.00% 0.00% 0.00%      
Risk free interest rate 2.70% 2.00% 1.20%      
Unrecognized share-based compensation            
Unrecognized share-based compensation cost $ 3.9          
Unrecognized share-based compensation - Weighted average period 1 year 6 months          
ESPP            
2016 Employee Stock Purchase Plan            
Granted (in shares) 0          
Common stock reserved for issuance (in shares)         150,000  
A&R 2015 Plan            
2016 Employee Stock Purchase Plan            
Common stock reserved for issuance (in shares) 415,077 0        
Inducement Plan            
2016 Employee Stock Purchase Plan            
Common stock reserved for issuance (in shares)       300,000    
2015 Plan            
Number of Options            
Vested 709,521 861,645 276,248      
Employees, Directors And Consultants | A&R 2015 Plan            
2016 Employee Stock Purchase Plan            
Common stock reserved for issuance (in shares)         2,400,000  
Number of Options            
Available for future issuance 701,261          
Employees, Directors And Consultants | Inducement Plan            
2016 Employee Stock Purchase Plan            
Vesting period 4 years          
Number of Options            
Available for future issuance 701,261          
Employees, Directors And Consultants | 2015 Plan            
2016 Employee Stock Purchase Plan            
Common stock reserved for issuance (in shares)           320,615