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Share-Based Payments - SOP 2015 (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 23, 2017
Aug. 25, 2016
Sep. 23, 2015
Apr. 02, 2015
SOP 2015            
Options            
Outstanding at beginning of year (in shares) 2,290,594          
Forfeited (in shares) (28,229)          
Outstanding at end of year (in shares) 2,262,365          
Vested and exercisable at end of year (in shares) 2,044,084          
Weighted average exercise price in $ per share            
Outstanding balance at beginning of year (in dollars per share) $ 8.33          
Forfeited (in dollars per share) 9.11          
Outstanding balance at end of year (in dollars per share) 8.32          
Vested and exercisable balance at end of year (in dollars per share) $ 8.22          
SOP 2015 | Stock Options            
Share-Based Payments            
Vesting period 4 years          
Exercise period 10 years          
Additional disclosures            
Share-based compensation expense $ 0.4 $ 0.9        
Weighted-average remaining contractual life 6 years 2 months 12 days          
Total unrecognized compensation related to unvested options $ 1.2          
Recognition period 7 months 6 days          
SOP 2015 | Stock Options | Vesting period, year one            
Share-Based Payments            
Vesting period 1 year          
Percentage that vests during the period 25.00%          
SOP 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”) | SOP 2015 | Common Stock            
Share-Based Payments            
Maximum number of shares authorized         177,499 95,000
Nabriva Therapeutics AG (“Nabriva Austria”) | SOP 2015 | Ordinary Shares            
Share-Based Payments            
Maximum number of shares authorized       346,235