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Accrued Liabilities
 6 Months Ended
Jun. 30, 2017
Payables and Accruals [Abstract]  
Accrued Liabilities
Accrued Liabilities
Accrued liabilities consist of the following:
 
June 30,
2017
 
December 31,
2016
 
(In thousands)
Employee compensation and related taxes
$
5,147

 
$
4,551

Contract research and development
4,541

 
3,030

Consulting and professional fees
4,484

 
2,223

Sales rebates and discounts
3,767

 
1,335

Clinical trials
964

 
1,167

Other accruals
2,740

 
946

       Total accrued liabilities
$
21,643

 
$
13,252