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Commitment & Contingencies - In-License Agreement for Lotilaner (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Sep. 03, 2020
Jun. 30, 2021
May 31, 2021
Apr. 30, 2021
Sep. 30, 2020
Jan. 31, 2019
May 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Research and development               $ 7,204,000   $ 1,737,000 $ 23,465,000 $ 3,249,000
Common stock issued for license agreement, value                 $ 5,494,000   5,494,000 $ 0
License agreement                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Research and development         $ 1,000,000.0 $ 1,000,000.0         $ 2,000,000.0  
Common stock issued for license agreement (shares)         222,460              
Common stock issued for license agreement, value         $ 3,100,000              
Common stock issued for license agreement, share price (usd per share)   $ 14.0003           $ 14.0003     $ 14.0003  
Additional shares to be issued upon 18-month anniversary of contract execution (shares)         187,500              
Additional shares to be issued upon 18-month anniversary of contract execution, value $ 5,500,000                      
Additional shares to be issued upon 18-month anniversary of contract execution, share price (usd per share)         $ 29.30              
License agreement | LianBio                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Upfront payment received   $ 10,000,000.0 $ 10,000,000.0 $ 15,000,000.0     $ 2,500,000          
License agreement | Elanco                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Upfront payment received             $ 25,000,000          
License agreement | Clinical milestones                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Maximum milestone payments   4,500,000       3,000,000.0   $ 4,500,000     $ 4,500,000  
License agreement | Commercial and sales milestones                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Maximum milestone payments   $ 77,000,000.0       $ 79,000,000.0   $ 77,000,000.0     $ 77,000,000.0