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Collaboration Agreements - Sanofi (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 15 Months Ended
Nov. 20, 2018
USD ($)
Aug. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Oct. 31, 2018
indication
Oct. 29, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Number of indications | indication                             3  
Milestones recognized     $ 4,672 $ 13,604 $ 4,197 $ 4,205 $ 125,676 $ 1,195 $ 1,648 $ 641 $ 26,678 $ 129,160 $ 0      
Collaborative Arrangement | Sanofi                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Upfront payment $ 125,000                              
Milestone payments upon achievement of certain clinical, regulatory and sales milestone events 1,100,000                              
Funded percentage                               70.00%
Receivable     $ 1,200       $ 2,300       1,200 2,300   $ 1,200    
Transaction price increase                     20,400 2,300        
Proceeds for milestone   $ 10,000                   0        
Milestones recognized                     10,000          
Collaborative Arrangement | Sanofi | Retained Activities                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Transaction price increase                     $ 10,400 $ 2,300        
Collaborative Arrangement | Sanofi | CNS Product                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Clinical and regulatory milestone payments 215,000                              
Regulatory milestone payment 385,000                              
Collaborative Arrangement | Sanofi | Peripheral Product                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Regulatory milestone payment 175,000                              
Clinical, regulatory and commercial milestone payments 120,000                              
Commercial milestone payments $ 200,000                              
Collaborative Arrangement | Sanofi | Product                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Milestones recognized                           0    
Collaborative Arrangement | Sanofi | Milestone Triggered                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Transaction price increase                           $ 10,000    
Collaborative Arrangement | Denali                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Funded percentage                               30.00%