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Fair Value Measurements - Summary of Asset and Liability Fair Values (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets:    
Equity securities (Note 3(a)) $ 95,038  
Equity securities (Note 10)   $ 37,530
Deferred compensation investments (life insurance cash surrender value - Note 3(g)) 6,123 14,887
Total Assets 265,113 269,082
Liabilities:    
Deferred executive compensation liability (Note 15(f)) 5,973 11,038
Drug development liability (Note 14) 12,191 12,386
Talon CVR (Note 9(a)) 6,693 6,210
Corixa Liability (Note 15(b)(i)) 62 62
Total Liabilities 24,919 29,696
Bank certificates of deposit [Member]    
Assets:    
Available-for-sale 249 248
Money market funds [Member]    
Assets:    
Available-for-sale 163,602 216,358
Mutual Funds [Member]    
Assets:    
Available-for-sale 101 59
Level 1 [Member]    
Assets:    
Equity securities (Note 3(a)) 95,038  
Equity securities (Note 10)   37,530
Deferred compensation investments (life insurance cash surrender value - Note 3(g)) 0 0
Total Assets 95,038 37,530
Liabilities:    
Deferred executive compensation liability (Note 15(f)) 0 0
Drug development liability (Note 14) 0 0
Talon CVR (Note 9(a)) 0 0
Corixa Liability (Note 15(b)(i)) 0 0
Total Liabilities 0 0
Level 1 [Member] | Bank certificates of deposit [Member]    
Assets:    
Available-for-sale 0 0
Level 1 [Member] | Money market funds [Member]    
Assets:    
Available-for-sale 0 0
Level 1 [Member] | Mutual Funds [Member]    
Assets:    
Available-for-sale 0 0
Level 2 [Member]    
Assets:    
Equity securities (Note 3(a)) 0  
Equity securities (Note 10)   0
Deferred compensation investments (life insurance cash surrender value - Note 3(g)) 6,123 14,887
Total Assets 170,075 231,552
Liabilities:    
Deferred executive compensation liability (Note 15(f)) 5,973 11,038
Drug development liability (Note 14) 0 0
Talon CVR (Note 9(a)) 0 0
Corixa Liability (Note 15(b)(i)) 0 0
Total Liabilities 5,973 11,038
Level 2 [Member] | Bank certificates of deposit [Member]    
Assets:    
Available-for-sale 249 248
Level 2 [Member] | Money market funds [Member]    
Assets:    
Available-for-sale 163,602 216,358
Level 2 [Member] | Mutual Funds [Member]    
Assets:    
Available-for-sale 101 59
Level 3 [Member]    
Assets:    
Equity securities (Note 3(a)) 0  
Equity securities (Note 10)   0
Deferred compensation investments (life insurance cash surrender value - Note 3(g)) 0 0
Total Assets 0 0
Liabilities:    
Deferred executive compensation liability (Note 15(f)) 0 0
Drug development liability (Note 14) 12,191 12,386
Talon CVR (Note 9(a)) 6,693 6,210
Corixa Liability (Note 15(b)(i)) 62 62
Total Liabilities 18,946 18,658
Level 3 [Member] | Bank certificates of deposit [Member]    
Assets:    
Available-for-sale 0 0
Level 3 [Member] | Money market funds [Member]    
Assets:    
Available-for-sale 0 0
Level 3 [Member] | Mutual Funds [Member]    
Assets:    
Available-for-sale $ 0 $ 0