Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.3.1.900
Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Customer
Product
Segment
$ / shares
Dec. 31, 2014
USD ($)
Customer
$ / shares
Dec. 31, 2013
USD ($)
Customer
Dec. 31, 2012
USD ($)
Significant Accounting Policies [Line Items]        
Extended service contracts The second deliverable is the lifetime warranty that provides for a functional oxygen concentrator for the remaining lifetime of the patient      
Accrual of product warranty liability $ 1,973,000 $ 1,115,000 $ 809,000 $ 447,000
Number of deliverables qualifying as separate units | Product 2      
Standard product warranty description The first deliverable is the oxygen concentrator equipment which comes with a standard warranty of three years      
Estimation for sale of products the Company estimates that 60% of its oxygen therapy patients will succumb to their disease within three years of initial diagnosis. Given the approximate mortality rate of 20% per year, the Company estimates on average all patients will succumb to their disease within five years of initial diagnosis.      
Deferred capped rental revenue $ 0 0    
Rental revenue earned 30-day period      
Payable $ 24,000 0    
Unbilled Receivables 5,155,000 3,653,000    
Increase in provision for bad debt and revenue adjustments related to prior years 1,380,000      
Accounts Receivable Net Current $ 19,872,000 19,349,000    
Percentage of Non-US revenue invoiced in Euros 53.60%      
Transfer of inventory to rental equipment $ 1,449,000      
Salvage value of expenditures for additions, improvements and replacements 0      
Repairs and maintenance expense 2,520,000 1,628,000    
Depreciation and amortization 13,926,000 11,930,000 8,341,000  
Impairments of long-lived assets 0 0    
Advertising costs $ 4,686,000 $ 3,290,000 $ 2,840,000  
Number of business segment | Segment 1      
Reverse stock split ratio 3:1      
Effective date of reverse stock split Nov. 12, 2013      
Common stock, par value | $ / shares $ 0.001 $ 0.001    
Construction in Process and Computer Software or Development Cost        
Significant Accounting Policies [Line Items]        
Depreciation and amortization $ 0 $ 0    
Customer Concentration Risk        
Significant Accounting Policies [Line Items]        
Accounts Receivable Net Current $ 7,441,000 $ 6,128,000    
Sales Revenue, Net | Customer Concentration Risk        
Significant Accounting Policies [Line Items]        
Number of customers | Customer 0 0 0  
Concentration risk, percentage 21.00% 26.50% 29.40%  
Accounts Receivable | Customer Concentration Risk        
Significant Accounting Policies [Line Items]        
Number of customers | Customer 0 0    
Concentration risk, percentage 37.40% 31.70%    
Sales Revenue, Services, Net | Customer Concentration Risk        
Significant Accounting Policies [Line Items]        
Concentration risk, percentage 73.70% 75.60% 72.60%  
Raw materials | Supplier Concentration Risk | Vendor one        
Significant Accounting Policies [Line Items]        
Concentration risk, percentage 21.60% 18.80%    
Raw materials | Supplier Concentration Risk | Vendor two        
Significant Accounting Policies [Line Items]        
Concentration risk, percentage 17.60% 16.40%    
Raw materials | Supplier Concentration Risk | Vendor three        
Significant Accounting Policies [Line Items]        
Concentration risk, percentage 9.30% 9.80%    
Service Contracts        
Significant Accounting Policies [Line Items]        
Extended service contracts The Company offers extended service contracts on its Inogen One concentrator line for periods ranging from 12 to 24 months after the end of the standard warranty period.