Inogen, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Customer Product Segment	Sep. 30, 2014 USD ($) Customer	Dec. 31, 2014 USD ($) Customer	Dec. 31, 2013 USD ($)
Significant Accounting Policies [Line Items]
Extended service contracts			The second deliverable is the lifetime warranty that provides for a functional oxygen concentrator for the remaining lifetime of the patient
Accrual of product warranty liability	$ 1,788,000		$ 1,788,000		$ 1,115,000	$ 809,000
Standard product warranty description			The first deliverable is the oxygen concentrator equipment which comes with a standard warranty of three years
Number of deliverables qualifying as separate units \| Product			2
Estimation for sale of products			the Company estimates that 60% of patients will succumb to their disease within three years. Given the approximate mortality rate of 20% per year, the Company estimates on average all patients will succumb to their disease within five years.
Deferred capped rental revenue	0		$ 0		0
Rental revenue earned			30-day period
Unbilled Receivables	5,718,000		$ 5,718,000		3,653,000
Accounts Receivable Net Current	$ 20,890,000		$ 20,890,000		19,349,000
Percentage of Non-US revenue invoiced in Euros	87.00%		75.00%
Transfer of inventory to rental equipment			$ 1,295,000
Salvage value of expenditures for additions, improvements and replacements	$ 0		0
Repairs and maintenance expense	686,000	$ 367,000	1,897,000	$ 1,157,000
Depreciation and amortization	3,539,000	3,148,000	10,404,000	8,654,000
Provision for income taxes	$ 982,000	$ 1,341,000	$ 3,683,000	$ 3,408,000
Effective tax rate	26.70%	38.60%	32.30%	39.10%
Number of business segment \| Segment			1
Construction In Progress And Computer Software
Significant Accounting Policies [Line Items]
Depreciation and amortization	$ 0	$ 0	$ 0	$ 0
Customer Concentration Risk
Significant Accounting Policies [Line Items]
Accounts Receivable Net Current	$ 7,533,000		$ 7,533,000		$ 4,875,000
Sales Revenue, Net \| Customer Concentration Risk
Significant Accounting Policies [Line Items]
Number of customers \| Customer			0	0
Concentration risk, percentage	21.50%	26.70%	21.10%	25.60%
Accounts Receivable \| Customer Concentration Risk
Significant Accounting Policies [Line Items]
Number of customers \| Customer			0		0
Concentration risk, percentage	36.10%				25.20%
Sales Revenue, Services, Net \| Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage	75.90%	78.60%	74.00%	74.30%
Raw materials \| Supplier Concentration Risk \| Vendor one
Significant Accounting Policies [Line Items]
Concentration risk, percentage			23.00%	18.80%
Raw materials \| Supplier Concentration Risk \| Vendor two
Significant Accounting Policies [Line Items]
Concentration risk, percentage			17.40%	17.80%
Raw materials \| Supplier Concentration Risk \| Vendor three
Significant Accounting Policies [Line Items]
Concentration risk, percentage			8.90%	8.00%
Service Contracts
Significant Accounting Policies [Line Items]
Extended service contracts			The Company offers extended service contracts on its Inogen One concentrator line for periods ranging from 12 to 24 months after the end of the standard warranty period.