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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Expenses    
Research, development and commercial contract costs $ 56,183 $ 59,420
Employee compensation 14,985 13,519
Accrued professional fees 10,475 12,042
Revenue-related reserves 644  
Other 1,776 3,725
Total $ 84,062 $ 88,706