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Share-Based Payments - 2017 Share Incentive Plan (Details) - 2017 Share Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 26, 2017
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Options        
Outstanding at beginning of year (in shares)     2,398,425  
Granted (in shares)     2,463,300  
Forfeited (in shares)     (351,456)  
Outstanding at end of year (in shares)   4,510,269 4,510,269 2,398,425
Vested and exercisable at end of year (in shares)   1,002,665 1,002,665  
Weighted average exercise price in $ per share        
Outstanding balance at beginning of year (in dollars per share)     $ 5.41  
Granted (in dollars per share)     1.95  
Forfeited (in dollars per share)     5.10  
Outstanding balance at end of year (in dollars per share)   $ 3.55 3.55 $ 5.41
Vested and exercisable balance at end of year (in dollars per share)   $ 5.70 $ 5.70  
Aggregate intrinsic value        
Aggregate intrinsic value, outstanding   $ 224 $ 224  
Aggregate intrinsic value, vested and exercisable   1 $ 1  
Stock Options        
Share-Based Payments        
Vesting period     10 years  
Fair Value Assumptions        
Expected term of options (in years)     6 years 1 month 6 days  
Weighted-average remaining contractual life     8 years 10 months 24 days  
Stock-Based Compensation Expense        
Share-based compensation expense   600 $ 1,900  
Weighted-average grant date fair value (in dollars per share)     $ 1.14  
Unrecognized compensation expense        
Total unrecognized compensation related to unvested options   5,700 $ 5,700  
Recognition period     1 year 4 months 24 days  
Stock Options | Minimum        
Fair Value Assumptions        
Expected volatility (as a percent)     61.40%  
Risk-free interest rate (as a percent)     1.90%  
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)     63.10%  
Risk-free interest rate (as a percent)     2.60%  
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        
Expiration period if drug is not approved       1 year
Stock-Based Compensation Expense        
Share-based compensation expense   $ 57 $ 152  
Restricted Stock Units        
Restricted stock granted during the period     479,000  
Weighted average grant date fair value per share     $ 1.90  
Number of shares vested     256,709  
Number of shares outstanding   479,000 479,000  
Restricted Stock Units ("RSUs") | Vesting period, year one        
Restricted Stock Units        
Percentage that vests during the period     25.00%  
Restricted Stock Units ("RSUs") | Immediate vesting upon regulatory approval        
Restricted Stock Units        
Percentage that vests during the period       50.00%
Restricted Stock Units ("RSUs") | Vesting upon the one-year-anniversary of FDA approval        
Restricted Stock Units        
Percentage that vests during the period       50.00%
Restricted Stock Units ("RSUs") | Vesting subject to FDA approval of NDA for XENLETA        
Stock-Based Compensation Expense        
Share-based compensation expense   $ 1,000 $ 1,000  
Restricted Stock Units        
Restricted stock granted during the period       371,550
Weighted average grant date fair value per share       $ 6.13
Restricted Stock Units ("RSUs") | Employees        
Stock-Based Compensation Expense        
Share-based compensation expense   $ 200 $ 700  
Weighted-average grant date fair value (in dollars per share)     $ 2.16  
Restricted Stock Units        
Aggregate number of shares granted under the plan   834,300 834,300  
Number of shares outstanding   461,586 461,586  
Ordinary Shares        
Share-Based Payments        
Number of shares authorized 3,000,000      
Additional shares authorized 3,438,990      
Shares available for grant   7,512,012 7,512,012  
Ordinary Shares | Minimum        
Share-Based Payments        
Annual increase, to be added on the first day of each fiscal year (in shares) 2,000,000      
Annual increase, to be added on the first day of each fiscal year (as a percent) 4.00%