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

Summary of Significant Accounting Policies - Sales Revenue Disaggregated by Sales Channel and Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total sales revenue	$ 340,546	$ 336,015	$ 225,492
Business to Business \| Domestic
Disaggregation Of Revenue [Line Items]
Total sales revenue	106,428	116,581	83,390
Business to Business \| International
Disaggregation Of Revenue [Line Items]
Total sales revenue	77,960	77,333	55,519
Direct-to-Consumer \| Domestic
Disaggregation Of Revenue [Line Items]
Total sales revenue	$ 156,158	$ 142,101	$ 86,583