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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accrued clinical trial expenses $ 4,942 $ 5,598
Accrued professional fees 8,639 12,581
Accrued technical operation expenses 4,762 6,446
Accrued royalty and milestone payments 3,025 3,117
Accrued interest payable 3,631 3,631
Accrued sales allowances and related costs 5,903 5,267
Accrued construction costs 201 2,689
Other accrued expenses 821 1,046
Total accrued expenses $ 31,924 $ 40,375