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

Warrants - Rollforward of Warrant Activity (Details)	12 Months Ended
Warrants - Rollforward of Warrant Activity (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class Of Warrant Or Right [Line Items]
Issued and outstanding warrants, beginning balance	263,463	384,217
Warrants Exercised	245,489	85,895
Warrants Expired	2,756	34,859
Issued and outstanding warrants, ending balance	15,218	263,463
Common stock
Class Of Warrant Or Right [Line Items]
Issued and outstanding warrants, beginning balance	233,611		233,611
Warrants Exercised	218,393
Issued and outstanding warrants, ending balance	15,218		233,611
Series C Preferred Stock
Class Of Warrant Or Right [Line Items]
Issued and outstanding warrants, beginning balance	14,215		14,215
Warrants Exercised	11,459
Warrants Expired	2,756
Issued and outstanding warrants, ending balance			14,215
Series D Preferred Stock
Class Of Warrant Or Right [Line Items]
Issued and outstanding warrants, beginning balance	11,415	132,169
Warrants Exercised	11,415	85,895
Warrants Expired		34,859
Issued and outstanding warrants, ending balance		11,415
Series E Preferred Stock
Class Of Warrant Or Right [Line Items]
Issued and outstanding warrants, beginning balance	4,222		4,222
Warrants Exercised	4,222
Issued and outstanding warrants, ending balance			4,222