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Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Accrued Expenses Accrued expenses consist of the following:
 
As of December 31,
2018
 
2017
(in thousands)
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

 

Accrued construction costs
2,946

 
1,719

Other accrued expenses
1,455

 
481

 
$
38,254

 
$
17,142