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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Expenses    
Research, development and commercial contract costs $ 51,823 $ 59,420
Employee compensation 9,460 13,519
Accrued professional fees 9,658 12,042
Property and equipment costs 465 906
Revenue-related reserves 327  
Other 2,228 2,819
Total $ 73,961 $ 88,706