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Share-Based Compensation - Share Based Compensation Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award    
Total share-based compensation expense $ 6,235 $ 7,365
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award    
Total share-based compensation expense 4,562 4,144
General and administrative    
Share-based Compensation Arrangement by Share-based Payment Award    
Total share-based compensation expense 1,627 3,221
Capitalized to property and equipment    
Share-based Compensation Arrangement by Share-based Payment Award    
Total share-based compensation expense $ 46 $ 0