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Accounts Payable and Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses consist of the following:
 
December 31,
(in thousands)
2018
 
2017
Accounts payable
$
6,606

 
$
7,867

Accrued professional fees
2,276

 
5,845

Accrued contract manufacturing & contract research costs
5,890

 
4,632

Accrued compensation and benefits
21,731

 
19,620

Accrued facility costs
2,102

 
1,665

Accrued program fees
16,674

 
5,707

Royalties payable
4,463

 
2,529

Accrued interest
4,189

 
313

Milestone payments
9,000

 

Accrued sales rebates and discounts
3,636

 
1,957

Other
4,058

 
3,755

 
$
80,625

 
$
53,890