Quarterly report pursuant to Section 13 or 15(d)

General - Additional Information (Details)

v3.2.0.727
General - Additional Information (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 20, 2014
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
lb
shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Customer
lb
shares
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2009
USD ($)
General Disclosures [Line Items]              
Revenues | $   $ 44,029 $ 30,393 $ 77,781 $ 54,026    
Common stock, shares outstanding   19,346,143   19,346,143   19,059,364  
Deemed dividend on redeemable convertible preferred stock | $         987    
Redeemable Convertible Preferred Stock              
General Disclosures [Line Items]              
Preferred stock outstanding   0   0   0  
Convertible Preferred Stock              
General Disclosures [Line Items]              
Preferred stock outstanding   0   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            
Comfort Life Medical, LLC              
General Disclosures [Line Items]              
Revenues | $           $ 112,500 $ 10,700
One G3              
General Disclosures [Line Items]              
Weight of oxygen portable device | lb   4.8   4.8      
One G2              
General Disclosures [Line Items]              
Weight of oxygen portable device | lb   7.0   7.0      
Maximum              
General Disclosures [Line Items]              
Percentage of patients using portable oxygen concentrators       7.00%      
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       5.00%      
Minimum | Inogen One              
General Disclosures [Line Items]              
Number of customers served over several years | Customer       97,000