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Intangible Assets - Gross carrying amount, accumulated amortization, and net book value (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Feb. 06, 2020
Feb. 05, 2020
Mar. 31, 2020
Mar. 31, 2019
Nov. 07, 2018
Dec. 31, 2019
Dec. 31, 2018
Nov. 08, 2018
Jan. 09, 2018
Gross carrying amount     $ 521,170     $ 154,089      
Amortization expense     (10,295) $ (3,688)   (14,752)      
Accumulated amortization     (134,881)     (124,586)      
Intangible assets, net     386,289     29,503      
Nucynta Products                  
Gross carrying amount     521,170     154,089 $ 154,089   $ 515,627
Amortization expense         $ (107,662)   (2,172)    
Accumulated amortization     (134,881)     (124,586) (109,834)    
Adjustment due to remeasurement of liability               $ (369,581)  
Additional costs incurred               $ 8,043  
Intangible assets, net     $ 386,289     $ 29,503 $ 44,255    
Nucynta Purchase Agreement                  
Amortization expense $ (8,541) $ (1,754)              
Additional costs incurred $ 367,081