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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued clinical trial expenses $ 6,635 $ 7,837
Accrued professional fees 13,398 4,500
Accrued technical operation expenses 9,371 2,182
Accrued interest payable 3,631 423
Accrued sales allowances and related costs 818 0
Accrued construction costs 2,946 1,719
Other accrued expenses 1,455 481
Total accrued expenses $ 38,254 $ 17,142