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

Convertible Preferred Stock - Additional Information (Details)					1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Redeemable convertible preferred stock	Dec. 31, 2013 Redeemable convertible preferred stock	Feb. 20, 2014 Series C Redeemable Convertible Preferred Stock	Dec. 31, 2013 Series C Redeemable Convertible Preferred Stock	Mar. 31, 2014 Initial Public Offering (IPO)	Mar. 31, 2014 Initial Public Offering (IPO) Redeemable convertible preferred stock	Mar. 31, 2014 Initial Public Offering (IPO) Nonredeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares issued	0	66,666	0	9,541,631		365,903		9,564,140	66,666
Conversion rate		1.01706				1.73014	14,259,647
Shares, Warrants expired/forfeited					2,756