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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Accounts receivable $ 32,884       $ 153       $ 32,884 $ 153  
Revenues 49,203 $ 13,725 $ 6,485 $ 62,093 3,458 $ 36,633 $ 16,457 $ 8,854 131,506 65,402  
Inventor royalties 11,002 1,181 1,241 21,744 13 0 4,273 666 35,168 4,952  
Contingent legal fees 11,756 $ 2,949 $ 1,037 $ 15,759 646 $ 12,173 $ 3,236 $ 627 31,501 16,682  
Accounts receivable         153         153 $ 4,695
Royalties and contingent legal fees payable 22,688       1,601       22,688 1,601 3,329
Accumulated deficit (422,541)       (320,018)       (422,541) (320,018) (317,512)
Noncontrolling interests         $ 1,358         $ 1,358 1,666
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 217    
Inventor royalties                 (873)    
Contingent legal fees                 519    
Accounts receivable 4,384               4,384    
Royalties and contingent legal fees payable 2,284               2,284    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 131,723    
Inventor royalties                 34,295    
Contingent legal fees                 32,020    
Accounts receivable 28,500               28,500    
Royalties and contingent legal fees payable $ 20,404               $ 20,404    
Adjustments for New Accounting Pronouncement [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Accounts receivable                     4,542
Royalties and contingent legal fees payable                     1,728
Accumulated deficit                     2,506
Noncontrolling interests                     $ 308