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Financial Instruments and Fair Value Measurements - Equity Investment in Entasis (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 27, 2020
USD ($)
$ / shares
shares
Apr. 12, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
tranche
item
Sep. 30, 2019
USD ($)
Sep. 01, 2020
Jun. 11, 2020
Equity Investment                
Changes in fair values of equity investments     $ (29,368) $ 0 $ 39,245 $ 0    
Entasis                
Equity Investment                
Number of tranches | tranche         2      
Number of investee's board members which may be designated by the Company | item         2      
Equity investment ownership percentage             52.60% 51.30%
Changes in fair values of equity investments     (17,000)   $ 16,300      
Common stock and warrants | Entasis                
Equity Investment                
Amount of securities purchase agreement $ 12,500 $ 35,000            
Equity investments at fair value     63,800   63,800      
Common stock | Entasis                
Equity Investment                
Number of shares to be purchased under the securities purchase agreement | shares 4,672,897 14,000,000            
Equity investments at fair value     $ 38,100   $ 38,100      
Warrants | Entasis                
Equity Investment                
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares 4,672,897 14,000,000            
Exercise price of warrants | $ / shares $ 2.675 $ 2.50            
Term of warrants     5 years   5 years      
Equity investments at fair value     $ 25,700   $ 25,700