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Share-Based Payments - SOP 2015 (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 23, 2017
Aug. 25, 2016
Sep. 23, 2015
Apr. 02, 2015
Stock Option Plan 2015                
Options                
Outstanding at beginning of year (in shares)     2,290,594          
Forfeited (in shares)     (63,179)          
Outstanding at end of year (in shares) 2,227,415   2,227,415          
Vested and exercisable at end of year (in shares) 2,073,469   2,073,469          
Weighted average exercise price in $ per share                
Outstanding balance at beginning of year (in dollars per share)     $ 8.33          
Forfeited (in dollars per share)     9.02          
Outstanding balance at end of year (in dollars per share) $ 8.31   8.31          
Vested and exercisable balance at end of year (in dollars per share) $ 8.23   $ 8.23          
Stock Option Plan 2015 | Stock Options                
Share-Based Payments                
Vesting period     4 years          
Exercise period     10 years          
Additional disclosures                
Share-based compensation expense $ 0.3 $ 0.7 $ 0.6 $ 1.6        
Weighted-average remaining contractual life     5 years 10 months 24 days          
Total unrecognized compensation related to unvested options $ 0.8   $ 0.8          
Recognition period     6 months          
Stock Option Plan 2015 | Stock Options | Vesting period, year one                
Share-Based Payments                
Vesting period     1 year          
Percentage that vests during the period     25.00%          
Stock Option Plan 2015 | Stock Options | Vesting period, years 2-4                
Share-Based Payments                
Percentage that vests during the period     75.00%          
Monthly vesting percentage     2.083%          
Nabriva Therapeutics AG ("Nabriva Austria") | Redomiciliation Transaction | Common Stock                
Share-Based Payments                
Number of shares to be awarded for each option when exercised         1      
Nabriva Therapeutics AG ("Nabriva Austria") | Redomiciliation Transaction | Ordinary Shares                
Share-Based Payments                
Number of shares to be awarded for each option when exercised         10      
Nabriva Therapeutics AG ("Nabriva Austria") | Stock Option Plan 2015 | Common Stock                
Share-Based Payments                
Maximum number of shares authorized             177,499 95,000
Nabriva Therapeutics AG ("Nabriva Austria") | Stock Option Plan 2015 | Ordinary Shares                
Share-Based Payments                
Maximum number of shares authorized           346,235