Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

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Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Customer
Product
Segment
Jun. 30, 2014
USD ($)
Customer
Dec. 31, 2014
USD ($)
Customer
Dec. 31, 2013
USD ($)
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 $ 1,606,000   $ 1,606,000   $ 1,115,000 $ 809,000
Standard product warranty description     The first deliverable is the oxygen concentrator equipment which comes with a standard warranty of three years      
Number of deliverables qualifying as separate units | Product     2      
Estimation for sale of products     the Company estimates that 60% of patients will succumb to their disease within three years. Given the approximate mortality rate of 20% per year, the Company estimates on average all patients will succumb to their disease within five years.      
Rental revenue earned     30-day period      
Funds held in money market 10,100,000   $ 10,100,000   42,300,000  
Unbilled Receivables 4,141,000   4,141,000   3,653,000  
Accounts Receivable Net Current $ 24,765,000   $ 24,765,000   19,349,000  
Percentage of Non-US revenue invoiced in Euros 70.00%   70.00%      
Salvage value of expenditures for additions, improvements and replacements $ 0   $ 0      
Repairs and maintenance expense 642,000 $ 400,000 1,212,000 $ 790,000    
Depreciation and amortization 3,442,000 2,887,000 6,865,000 5,506,000    
Provision for income taxes $ 1,855,000 $ 1,490,000 $ 2,701,000 $ 2,067,000    
Effective tax rate 34.90% 39.50% 34.90% 39.40%    
Number of business segment | Segment     1      
Construction In Progress And Computer Software            
Significant Accounting Policies [Line Items]            
Depreciation and amortization $ 0 $ 0 $ 0 $ 0    
Customer Concentration Risk            
Significant Accounting Policies [Line Items]            
Accounts Receivable Net Current $ 7,488,000   $ 7,488,000   $ 4,875,000  
Sales Revenue, Net            
Significant Accounting Policies [Line Items]            
Number of customers | Customer     0 0    
Sales Revenue, Net | Customer Concentration Risk            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage 19.30% 23.40% 21.00% 25.00%    
Accounts Receivable            
Significant Accounting Policies [Line Items]            
Number of customers | Customer     0   0  
Accounts Receivable | Customer Concentration Risk            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage 30.20%       25.20%  
Sales Revenue, Services, Net | Customer Concentration Risk            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage 73.10% 71.70% 72.90% 72.10%    
Raw materials | Supplier Concentration Risk | Vendor one            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage     21.60% 22.60%    
Raw materials | Supplier Concentration Risk | Vendor two            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage     17.70% 18.10%    
Raw materials | Supplier Concentration Risk | Vendor three            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage     9.60% 8.50%    
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.