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Concentrations of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2019
Concentrations of Credit Risk  
Schedule of concentration of credit risk related to collaborative partners

Percentage of Total Milestone and

Contract Revenues for the

Years Ended,

December 31,

 

2019

2018

2017

Collaboration Partner A

%  

33

%  

37

%  

Collaboration Partner B

%  

67

%  

63

%  

Collaboration Partner C

77

%  

%  

%  

Collaboration Partner D

23

%  

%  

%  

Schedule of concentration of credit risk related to specialty pharmacy customers

Percentage of Total Net

Product Revenues for the

Years Ended,

December 31,

 

2019

2018

2017

Customer A

20

%  

20

%  

24

%

Customer B

13

%  

14

%  

15

%

Customer C

16

%  

15

%  

13

%

Customer D

11

%  

11

%  

8

%