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Accounts payable and accrued expenses
12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Accounts payable and accrued expenses
Accounts payable and accrued expenses
Accounts payable and accrued expenses at December 31, 2017 and 2016 consist of the following:
 
 
December 31,
 
 
2017
 
2016
Employee compensation, benefits, and related accruals
 
$
17,711

 
$
13,649

Consulting and contracted research
 
5,137

 
11,505

Professional fees
 
2,116

 
1,237

Sales allowances and other related costs
 
33,914

 
13,245

Accounts payable
 
15,282

 
6,298

Other
 
2,286

 
2,825

 
 
$
76,446

 
$
48,759