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Share-Based Payments - 2017 Share Incentive Plan (Details) - 2017 Share Incentive Plan
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 26, 2017
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2018
item
Options            
Outstanding at beginning of year (in shares) | shares       4,422,664    
Granted (in shares) | shares       1,290,500    
Forfeited (in shares) | shares       (1,015,723)    
Outstanding at end of year (in shares) | shares   4,697,441   4,697,441    
Vested and exercisable at end of year (in shares) | shares   2,204,830   2,204,830    
Weighted average exercise price in $ per share            
Outstanding balance at beginning of year (in dollars per share) | $ / shares       $ 3.55    
Granted (in dollars per share) | $ / shares       1.35    
Forfeited (in dollars per share) | $ / shares       2.84    
Outstanding balance at end of year (in dollars per share) | $ / shares   $ 3.10   3.10    
Vested and exercisable balance at end of year (in dollars per share) | $ / shares   $ 3.94   $ 3.94    
Fair Value Assumptions            
Weighted-average remaining contractual life       8 years 4 months 24 days    
Stock Options            
Share-Based Payments            
Vesting period       10 years    
Fair Value Assumptions            
Expected term of options (in years)       6 years 1 month 6 days    
Stock-Based Compensation Expense            
Share-based compensation expense | $   $ 0.5 $ 0.6 $ 1.6 $ 1.9  
Unrecognized compensation expense            
Total unrecognized compensation related to unvested options | $   3.3   $ 3.3    
Recognition period       1 year    
Restricted Stock Units            
Weighted average grant date fair value per share | $ / shares       $ 0.80    
weighted average fair value per share            
Granted | $ / shares       $ 0.80    
Stock Options | Minimum            
Fair Value Assumptions            
Expected volatility (as a percent)       63.80%    
Risk-free interest rate (as a percent)       0.80%    
Term of U.S. treasury securities used to estimate risk free interest rate       5 years    
Stock Options | Maximum            
Fair Value Assumptions            
Expected volatility (as a percent)       64.00%    
Risk-free interest rate (as a percent)       1.50%    
Term of U.S. treasury securities used to estimate risk free interest rate       7 years    
SARs            
Share-Based Payments            
Vesting period       10 years    
Restricted Stock Units ("RSUs")            
Share-Based Payments            
Vesting period       4 years    
Fair Value | $       $ 0.9    
Stock-Based Compensation Expense            
Share-based compensation expense | $   0.3 $ 57.0 1.3 $ 152.0  
Unrecognized compensation expense            
Total unrecognized compensation related to unvested options | $   $ 2.2   $ 2.2    
Recognition period       1 year 2 months 12 days    
Restricted Stock Units            
Weighted average grant date fair value per share | $ / shares       $ 1.35    
Number of shares outstanding | shares       901,686    
Granted | shares       1,557,300    
Vested and issued | shares       (508,772)    
Forfeited | shares       (253,292)    
Number of shares outstanding | shares   1,696,922   1,696,922    
weighted average fair value per share            
Weighted average fair value at the beginning | $ / shares       $ 3.69    
Granted | $ / shares       1.35    
Vested and issued | $ / shares       3.16    
Forfeited | $ / shares       1.82    
Weighted average fair value at the end | $ / shares   $ 1.48   $ 1.48    
Restricted Stock Units ("RSUs") | Vesting period, year one            
Restricted Stock Units            
Percentage that vests during the period       25.00%    
Restricted Stock Units ("RSUs") | Employees            
Share-Based Payments            
Number of vesting periods | item           3
Vesting period       4 years   6 months
Restricted Stock Units            
Percentage that vests during the period       25.00%    
Ordinary Shares            
Share-Based Payments            
Number of shares authorized | shares 3,000,000          
Additional shares authorized | shares 3,438,990          
Ordinary Shares | Minimum            
Share-Based Payments            
Annual increase, to be added on the first day of each fiscal year (in shares) | shares 2,000,000          
Annual increase, to be added on the first day of each fiscal year (as a percent) 4.00%          
XENLETA | Restricted Stock Units ("RSUs") | Immediate vesting upon regulatory approval            
Restricted Stock Units            
Percentage that vests during the period           50.00%
XENLETA | Restricted Stock Units ("RSUs") | Vesting upon the one-year-anniversary of FDA approval            
Restricted Stock Units            
Percentage that vests during the period           50.00%
CONTEPO | Restricted Stock Units ("RSUs") | Immediate vesting upon regulatory approval            
Restricted Stock Units            
Percentage that vests during the period           50.00%
CONTEPO | Restricted Stock Units ("RSUs") | Vesting upon the one-year-anniversary of FDA approval            
Restricted Stock Units            
Percentage that vests during the period           50.00%