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REVENUE, CREDIT CONCENTRATIONS AND GEOGRAPHIC INFORMATION (Tables)
6 Months Ended
Jun. 30, 2021
Concentration Risk And Geographic Information [Abstract]  
Schedule of Total Revenues from External Customers and Collaborative Partners by Geographic Region The following table disaggregates Total Revenues from external customers and collaborative partners by geographic region. Net product revenues by geographic region are based on patient location for the Company’s commercial products, except for Aldurazyme, which is sold exclusively to Sanofi Genzyme (Genzyme) who markets and sells Aldurazyme worldwide. Aldurazyme revenues earned by the Company are included in the U.S. region as the transactions are with Genzyme, whose headquarters is located in the U.S.  
Three Months Ended
June 30,
Six Months Ended
June 30,
2021202020212020
Total revenues by geographic region:
United States$204,245 $232,552 $412,431 $476,724 
Europe172,678 109,259 334,519 254,295 
Latin America42,248 37,864 101,953 97,788 
Rest of world82,522 49,810 138,820 102,747 
Total revenues$501,693 $429,485 $987,723 $931,554 
Schedule of Net Product Revenues by Product
The following table disaggregates total Net Product Revenues by product.
Three Months Ended
June 30,
Six Months Ended
June 30,
2021202020212020
Net product revenues by product:
Vimizim$171,655 $116,695 $329,953 $253,898 
Naglazyme118,813 81,006 226,149 195,262 
Kuvan78,807 122,611 149,570 244,611 
Palynziq58,935 40,630 112,973 75,262 
Brineura30,332 25,798 57,657 49,768 
Firdapse— — — 1,316 
Total net product revenues marketed by the Company$458,542 $386,740 $876,302 $820,117 
Aldurazyme net product revenues marketed by Genzyme28,128 32,292 $78,137 $87,958 
Total net product revenues$486,670 $419,032 $954,439 $908,075 
Schedule of Total Net Product Revenues Based on Patient Location
The table below disaggregates total Net Product Revenues based on patient location for products sold directly by the Company, and global sales of Aldurazyme, which is marketed by Genzyme. 
Three Months Ended
June 30,
Six Months Ended
June 30,
2021202020212020
United States$169,411 $197,171 $324,474 $378,842 
Europe166,704 104,319 315,576 245,170 
Latin America42,248 37,864 101,953 97,788 
Rest of world80,179 47,386 134,299 98,317 
Total net product revenues marketed by the Company$458,542 $386,740 $876,302 $820,117 
Aldurazyme net product revenues marketed by Genzyme28,128 32,292 78,137 87,958 
Total net product revenues$486,670 $419,032 $954,439 $908,075 
Schedule of Net Product Revenue Concentrations Attributed to Largest Customers
The following table illustrates the percentage of the Company’s total Net Product Revenues attributed to the Company’s largest customers for the periods presented. 
Three Months Ended
June 30,
Six Months Ended
June 30,
2021202020212020
Customer A16 %15 %16 %14 %
Customer B13 %16 %13 %14 %
Customer C12 %%10 %%
Customer D%13 %%12 %
Total50 %48 %48 %46 %