Quarterly report pursuant to Section 13 or 15(d)

General - Additional Information (Details)

v3.3.0.814
General - Additional Information (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Feb. 20, 2014
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Customer
lb
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
shares
General Disclosures [Line Items]        
Accounts payable and accrued expenses | $   $ 3,030 $ 2,063  
Other noncurrent liabilities | $   $ (54) (81)  
Common stock, shares outstanding   19,586,673   19,059,364
Deemed dividend on redeemable convertible preferred stock | $     987  
Redeemable Convertible Preferred Stock        
General Disclosures [Line Items]        
Preferred stock outstanding   0   0
Convertible Preferred Stock        
General Disclosures [Line Items]        
Preferred stock outstanding   0   0
Initial Public Offering (IPO)        
General Disclosures [Line Items]        
Number of shares sold 4,511,313      
Shares sold, price per share | $ / shares $ 16.00      
Amount after underwriters’ discount and other associated expenses | $ $ 49,668      
Initial Public Offering (IPO) | Common stock        
General Disclosures [Line Items]        
Conversion of preferred stock, shares 14,259,647      
Initial Public Offering (IPO) | Stockholders        
General Disclosures [Line Items]        
Number of shares sold 981,902      
Initial Public Offering (IPO) | Redeemable Convertible Preferred Stock        
General Disclosures [Line Items]        
Convertible preferred stock, shares issued upon conversion 9,546,140      
Deemed dividend on redeemable convertible preferred stock | $     987  
Initial Public Offering (IPO) | Convertible Preferred Stock        
General Disclosures [Line Items]        
Convertible preferred stock, shares issued upon conversion 66,666      
Initial Public Offering (IPO) | Inogen, Inc.        
General Disclosures [Line Items]        
Number of shares sold 3,529,411      
Previously Reported        
General Disclosures [Line Items]        
Accounts payable and accrued expenses | $     1,982  
Other noncurrent liabilities | $     $ 0  
One G3        
General Disclosures [Line Items]        
Weight of oxygen portable device | lb   4.8    
One G2        
General Disclosures [Line Items]        
Weight of oxygen portable device | lb   7.0    
Maximum        
General Disclosures [Line Items]        
Percentage of patients using portable oxygen concentrators   8.00%    
Maximum | One G3        
General Disclosures [Line Items]        
Estimated battery life of portable oxygen concentrator   4 hours 30 minutes    
Maximum | One G2        
General Disclosures [Line Items]        
Estimated battery life of portable oxygen concentrator   5 hours    
Minimum        
General Disclosures [Line Items]        
Percentage of patients using portable oxygen concentrators   6.00%    
Minimum | Inogen One        
General Disclosures [Line Items]        
Number of customers served over several years | Customer   112,000