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Fair Value Measurements (Narrative) (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 13, 2016
Sep. 21, 2016
Jul. 08, 2016
Jun. 02, 2016
Sep. 22, 2015
Apr. 30, 2013
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Jul. 03, 2017
Mar. 30, 2017
Dec. 31, 2016
Jul. 09, 2016
Sep. 23, 2015
Sep. 18, 2015
Jul. 28, 2015
Nov. 06, 2014
Jun. 26, 2014
Oct. 18, 2013
Apr. 18, 2013
Accounts and Notes Receivable, Net             $ 51,400,000 $ 51,400,000       $ 105,300,000                
Investments-other             0 [1] 0 [1]   $ 75,000,000   75,000,000 [1]                
Cash payment for purchase of royalty right                                 $ 65,600,000      
Change of ownership repayment                     $ 108,200,000                  
Revenue Recognition, Milestone Method, Revenue Recognized $ 6,000,000 $ 5,000,000   $ 6,000,000                                
Royalty rights             351,969,000 [1] 351,969,000 [1]       402,318,000 [2]                
Transfers from level 1 to level 2, amount             0 0       0                
Transfers from level 2 to level 1, amount             0 0       0                
Percentage of royalty acquired                                 75.00%      
Financing receivable, gross                                       $ 20,000,000
Proceeds from Collection of Notes Receivable         $ 21,400,000     8,142,000 $ 54,653,000                      
Notes Receivable, Fair Value Disclosure             $ 53,500,000 $ 53,500,000       $ 107,400,000                
Depomed [Member]                                        
Cash payment for purchase of royalty right                                     $ 240,500,000  
Purchase of royalty rights                                     241,300,000  
Royalty right purchase transaction costs                                     $ 800,000  
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate             15.00% 15.00%                        
Fair Value Measurements, Sensitivity Analysis, Description               Should these discount rates increase or decrease by 2.5%, the fair value of the asset could decrease by $12.5 million or increase by $14.0 million, respectively. A third-party expert was engaged to help management develop its original estimate of the expected future cash flows. The estimated fair value of the asset is subject to variation should those cash flows vary significantly from those estimates. The Company periodically assesses the expected future cash flows and to the extent such payments are greater or less than its initial estimates, or the timing of such payments is materially different than the original estimates, the Company will adjust the estimated fair value of the asset. Should the expected royalties increase or decrease by 2.5%, the fair value of the asset could increase or decrease by $5.6 million, respectively.                        
Royalty rights             $ 222,700,000 $ 222,700,000                        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount             $ 222,700,000 $ 222,700,000                        
VB [Member]                                        
Purchase of royalty rights                                   $ 15,500,000    
Fair value inputs, discount rate (in Percent)             17.50%                          
Fair Value Measurements, Sensitivity Analysis, Description               Should this discount rate increase or decrease by 2.5%, the fair value of this asset could decrease by $1.2 million or increase by $1.3 million, respectively. Should the expected royalties increase or decrease by 2.5%, the fair value of the asset could increase or decrease by $0.4 million, respectively.                        
Royalty rights             $ 15,400,000 $ 15,400,000                        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount             $ 15,400,000 $ 15,400,000                        
University of Michigan [Member]                                        
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate             12.80% 12.80%                        
Fair Value Measurements, Sensitivity Analysis, Description             Should this discount rate increase or decrease by 2.5%, the fair value of this asset could decrease by $2.0 million or increase by $2.2 million, respectively. Should the expected royalties increase or decrease by 2.5%, the fair value of the asset could increase by $0.9 million or decrease by $0.9 million, respectively.                          
Royalty rights             $ 35,400,000 $ 35,400,000                        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount             $ 35,400,000 $ 35,400,000                        
ARIAD [Member]                                        
Purchase of royalty rights                               $ 100,000,000        
Royalty Guarantees, Commitments, Amount                               200,000,000        
ARIAD [Member] | Tranche 1 [Member]                                        
Purchase of royalty rights                               50,000,000        
ARIAD [Member] | Tranche 3 [Member]                                        
Cash payment for purchase of royalty right                               $ 100,000,000        
AcelRx [Member]                                        
Purchase of royalty rights                             $ 65,000,000          
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate             13.40% 13.40%                        
Fair Value Measurements, Sensitivity Analysis, Description             Should this discount rate increase or decrease by 2.5%, the fair value of this asset could decrease by $10.2 million or increase by $12.6 million, respectively. Should the expected royalties increase or decrease by 2.5%, the fair value of the asset could increase or decrease by $1.9 million, respectively                          
Royalty rights             $ 74,100,000 $ 74,100,000                        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount             $ 74,100,000 $ 74,100,000                        
Percentage of royalty acquired                             75.00%          
Avinger Royalty Right [Member]                                        
Fixed royalty rate as a percentage of sales                           0.90%           1.80%
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate             15.00% 15.00%                        
Fair Value Measurements, Sensitivity Analysis, Description             Significant judgment is required in selecting the appropriate discount rate. Should this discount rate increase or decrease by 5%, the fair value of this asset could decrease by $16,000 or increase by $17,000, respectively. Should the expected royalties increase or decrease by 5%, the fair value of the asset could increase or decrease by $43,000, respectively.                          
Royalty rights             $ 900,000 $ 900,000                        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount             $ 900,000 $ 900,000                        
Kybella [Member]                                        
Purchase of royalty rights                         $ 9,500,000              
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate             14.40% 14.40%                        
Fair Value Measurements, Sensitivity Analysis, Description             Should this discount rate increase or decrease by 2.5%, the fair value of this asset could decrease by $0.3 million or increase by $0.3 million, respectively. Should the expected royalties increase or decrease by 2.5%, the fair value of the asset could increase by $0.1 million or decrease by $0.1 million, respectively                          
Royalty rights             $ 3,500,000 $ 3,500,000                        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount             $ 3,500,000 $ 3,500,000                        
Maximum amount of additional funds, upon attainment of milestones     $ 1,000,000                                  
Avinger [Member]                                        
Proceeds from Collection of Notes Receivable         $ 21,400,000                              
Avinger [Member] | Notes Receivable [Member]                                        
Amount company has agreed to advance under credit agreement           $ 40,000,000                            
[1] unaudited
[2] Note 1