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

Basis of Presentation and Summary of Significant Accounting Policies - Sales Revenue Disaggregated by Sales Channel and Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Total sales revenue	$ 86,392	$ 89,712	$ 267,073	$ 255,283
Business to Business \| Domestic
Disaggregation Of Revenue [Line Items]
Total sales revenue	30,143	30,263	85,857	91,222
Business to Business \| International
Disaggregation Of Revenue [Line Items]
Total sales revenue	18,492	21,142	60,859	58,807
Direct-to-Consumer \| Domestic
Disaggregation Of Revenue [Line Items]
Total sales revenue	$ 37,757	$ 38,307	$ 120,357	$ 105,254