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Other Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets Other intangible assets:
Other intangible assets, net, consisting of product rights and licenses are summarized as follows:
December 31, 2021Gross Carrying
Value		Accumulated
Amortization		Intangible  Assets,
net		Remaining Weighted  average
Useful Life
BELBUCA license and distribution rights45,000 (22,500)22,500 5.3
Symproic license and distribution rights30,636 (6,695)23,941 10.3
ELYXYB product rights15,456 (349)15,107 14.5
Total intangible assets$91,092 $(29,544)$61,548 8.5
December 31, 2020Gross Carrying
Value		Accumulated
Amortization		Intangible Assets,
net		Remaining Weighted average
Useful Life
Product rights$6,050 $(6,050)$— 
BELBUCA license and distribution rights45,000 (18,000)27,000 6.0
Symproic license and distribution rights30,636 (4,260)26,376 10.8
Total intangible assets$81,686 $(28,310)$53,376 7.9

The Company incurred amortization expense on other intangible assets of approximately $7.3 million, $7.0 million and $7.0 million for the years ended December 31, 2021, 2020 and 2019, respectively. Estimated aggregate future amortization expenses for other intangible assets for each of the next five years and thereafter are as follows:
Years ending December 31,
2022$7,982 
20237,982 
20247,982 
20257,982 
20267,982 
Thereafter21,636 
Total amortization expense61,548