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Accounts payable and accrued expenses
3 Months Ended
Mar. 31, 2018
Payables and Accruals [Abstract]  
Accounts payable and accrued expenses
Accounts payable and accrued expenses
Accounts payable and accrued expenses at March 31, 2018 and December 31, 2017 consist of the following:
 
 
March 31,
2018
 
December 31,
2017
Employee compensation, benefits, and related accruals
 
$
9,243

 
$
17,711

Consulting and contracted research
 
6,570

 
5,137

Professional fees
 
3,100

 
2,116

Sales allowance and other costs
 
25,098

 
22,257

Sales rebates and royalties
 
16,380

 
11,657

Accounts payable
 
3,104

 
15,282

Other
 
7,942

 
2,286

 
 
$
71,437

 
$
76,446