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Share-Based Compensation - General (Details)
1 Months Ended 9 Months Ended
Feb. 28, 2019
shares
Sep. 30, 2019
item
shares
Share-Based Compensation    
Number of equity incentive plans | item   2
2015 Plan    
Share-Based Compensation    
Maximum number of shares authorized to be issued   9,500,000
Additional number of shares authorized to be issued   450,000
2019 Inducement Plan | Newly-hired employees    
Share-Based Compensation    
Number of equity incentive plans   1
Granted (in shares) 99,000  
Amended and Restated Equity Incentive Plan (The 1999 Plan)    
Share-Based Compensation    
Granted (in shares)   0