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100420 - Disclosure - Composition of Certain Financial Statement Items - Schedule of Intangible Assets (Detail)
(http://www.entellusmedical.com/20161231/taxonomy/role/DisclosureCompositionOfCertainFinancialStatementItemsScheduleOfIntangibleAssetsDetail)
TableSchedule Of Finite Lived Intangible Assets [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001374128 (http://www.sec.gov/CIK)
Finite Lived Intangible Assets [Line Items]Period [Axis]
2016-12-31
Finite-Lived Intangible Assets by Major Class
Technologies [Member]Trade Names [Member]Finite-Lived Intangible Assets, Major Class Name
Intangible assets, gross
9,700,000  
500,000  
10,200,000  
Less accumulated amortization
  
(360,000) 
Total
 
 
 
 
9,840,000