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Commitments and Contingencies (Details)
6 Months Ended
May 09, 2019
patent
Nov. 30, 2018
patent
Sep. 26, 2018
lawsuit
Jun. 12, 2018
lawsuit
May 24, 2018
lawsuit
Mar. 24, 2015
patent
Jun. 30, 2019
patent
lawsuit
Contingencies              
Stay period before FDA can issue a final approval unless it is terminated             30 months
Number of lawsuits filed | lawsuit     2 4 2    
Number of patents listed in FDA Orange Book             15
Purdue Pharma, L. P. patent infringement suit, District of Delaware              
Contingencies              
Number of patents allegedly infringed           3 5
Purdue Pharma, L. P. patent infringement suit, District of Massachusetts              
Contingencies              
Number of patents found not infringed             3
Teva Litigation [member]              
Contingencies              
Stay period before FDA can issue a final approval unless it is terminated             30 months
Number of patents allegedly infringed             11
Number of Orange Book patents asserted to have been infringed 1 2          
Payor Groups and Warminister Township [Member]              
Contingencies              
Number of lawsuits filed | lawsuit             3