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Net Product Sales (Tables)
 12 Months Ended
Dec. 31, 2014
Revenues [Abstract]  
Sales Related Deductions Activity
The following table summarizes the provisions, and credits/payments, for these sales-related deductions for the years ended December 31, 2014, 2013, and 2012.
 
Rebates &
Chargebacks
 
Distribution-
Related
Fees
 
Other Sales-
Related
Deductions
 
Total
Balance as of December 31, 2011
$
585

 
$
1,451

 
$
182

 
$
2,218

Provision related to current period sales
14,153

 
45,028

 
3,070

 
62,251

Credits/payments
(11,755
)
 
(31,181
)
 
(2,707
)
 
(45,643
)
Balance as of December 31, 2012
2,983

 
15,298

 
545

 
18,826

Provision related to current period sales
25,936

 
62,984

 
955

 
89,875

Credits/payments
(24,519
)
 
(58,619
)
 
(962
)
 
(84,100
)
Balance as of December 31, 2013
4,400

 
19,663

 
538

 
24,601

Provision related to current period sales
33,117

 
77,160

 
1,578

 
111,855

Credits/payments
(34,434
)
 
(75,657
)
 
(1,584
)
 
(111,675
)
Balance as of December 31, 2014
$
3,083

 
$
21,166

 
$
532

 
$
24,781