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Accounts payable and accrued expenses
9 Months Ended
Sep. 30, 2019
Payables and Accruals [Abstract]  
Accounts payable and accrued expenses
Accounts payable and accrued expenses
Accounts payable and accrued expenses at September 30, 2019 and December 31, 2018 consist of the following:
 
 
September 30,
2019
 
December 31,
2018
Employee compensation, benefits, and related accruals
 
$
25,800

 
$
27,629

Consulting and contracted research
 
2,356

 
11,267

Professional fees
 
10,300

 
5,574

Sales allowance and other costs
 
37,129

 
29,417

Sales rebates and royalties
 
33,645

 
31,874

Accounts payable
 
8,959

 
6,001

Other
 
9,961

 
16,437

Balance at September 30, 2019
 
$
128,150

 
$
128,199