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Intangible Assets - Warrant and Amortization - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jan. 09, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Nov. 30, 2018
Intangible Assets            
Common stock that may be purchased upon exercise of warrant (in shares)           1,041,667
Exercise price of warrant (in dollars per share)           $ 19.20
Useful life 4 years     2 years 6 months    
Amortization expense recognized prior to third amendment       $ 107,662    
Amortization expense for Nucynta asset acquisition   $ 3,688 $ 32,407 7,376 $ 61,933  
2019   7,376   7,376    
2020   14,752   14,752    
2021   $ 14,751   $ 14,751