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Accounts Payable, Accrued Expenses, and Other Current Liabilities
 12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Accounts Payable, Accrued Expenses, and Other Current Liabilities Accounts Payable, Accrued Expenses, and Other Current Liabilities
Accounts payable, accrued expenses, and other current liabilities consist of the following:

 
 
December 31,
(in thousands)
 
2019
 
2018
Accounts payable
 
$
21,722

 
$
6,606

Accrued professional fees
 
7,832

 
2,276

Accrued contract manufacturing & contract research costs
 
17,800

 
5,890

Accrued compensation and benefits
 
27,156

 
21,731

Accrued program fees
 
17,016

 
16,674

Accrued royalties
 
5,196

 
4,463

Accrued interest
 
3,679

 
4,189

Accrued milestones
 
4,000

 
9,000

Accrued sales rebates and discounts
 
5,900

 
3,636

Accrued taxes
 
7,300

 
1,330

Other
 
2,772

 
4,830

 
 
$
120,373

 
$
80,625