Inogen, Inc. Annual report pursuant to Section 13 and 15(d)

Schedule II: Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	$ 1,141	$ 742	$ 865
Additions	1,692	2,045	1,071
Deletions	1,404	1,284	1,194
Adjustments	(249)	(362)
Balance at End of Year	1,180	1,141	742
Allowance for Sales Returns
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	134	64	33
Additions	3,451	1,770	627
Deletions	3,412	1,700	596
Balance at End of Year	173	134	64
Allowance for Rental Revenue Adjustments
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	2,115	1,255	984
Additions	8,267	6,613	3,102
Deletions	8,239	6,115	2,831
Adjustments	249	362
Balance at End of Year	2,392	2,115	1,255
Allowance for Inventory Reserves
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	100	98	108
Additions	201	78	42
Deletions	160	76	52
Balance at End of Year	141	100	98
Allowance for Rental Asset Loss
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	157	77
Additions	1,443	292	378
Deletions	768	212	301
Balance at End of Year	$ 832	$ 157	$ 77