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Accounts payable and accrued expenses
9 Months Ended
Sep. 30, 2018
Payables and Accruals [Abstract]  
Accounts payable and accrued expenses
Accounts payable and accrued expenses
Accounts payable and accrued expenses at September 30, 2018 and December 31, 2017 consist of the following:
 
 
September 30,
2018
 
December 31,
2017
Employee compensation, benefits, and related accruals
 
$
18,003

 
$
17,711

Consulting and contracted research
 
8,111

 
5,137

Professional fees
 
3,541

 
2,116

Sales allowance and other costs
 
27,027

 
22,257

Sales rebates and royalties
 
26,818

 
11,657

Accounts payable
 
6,538

 
15,282

Other
 
12,750

 
2,286

 
 
$
102,788

 
$
76,446