Annual report pursuant to Section 13 and 15(d)

Subsequent events - Additional Information (Details)

v2.4.1.9
Subsequent events - Additional Information (Details) (Subsequent Event, Rockbridge Investments, L.P., Second Amendment, USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jan. 20, 2015
sqft
Subsequent Event | Rockbridge Investments, L.P. | Second Amendment
 
Subsequent Event [Line Items]  
Area of office space leased 38,851ingn_AreaOfOfficeSpaceLeased
/ ingn_AmendmentAxis
= ingn_SecondAmendmentMember
/ dei_LegalEntityAxis
= ingn_RockbridgeInvestmentsLimitedPartnershipMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Lease expiration date Oct. 31, 2015
Lease renewal term 5 years
Lease commencement date Nov. 01, 2015
Extended lease expiration date Oct. 31, 2020
Minimum monthly rent $ 45us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ ingn_AmendmentAxis
= ingn_SecondAmendmentMember
/ dei_LegalEntityAxis
= ingn_RockbridgeInvestmentsLimitedPartnershipMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Annual percentage increase in rental expense 3.00%ingn_OperatingLeaseRentalExpenseIncreasePercentage
/ ingn_AmendmentAxis
= ingn_SecondAmendmentMember
/ dei_LegalEntityAxis
= ingn_RockbridgeInvestmentsLimitedPartnershipMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Optional lease renewal term 5 years
Optional lease commencement date Nov. 01, 2020