Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.6.0.2
Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
Financial_Institutions
Oct. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Financial_Institutions
Customer
Segment
shares
Dec. 31, 2015
USD ($)
Customer
shares
Summary Of Significant Accounting Policies [Line Items]          
Number of reportable segments | Segment       1  
Maintenance of cash and cash equivalents with number of financial institutions | Financial_Institutions 2     2  
Liquid Investments with original maturities period       Three months or less  
Estimated obsolete inventory $ 200,000   $ 100,000 $ 200,000 $ 100,000
Medical equipment in rental services useful life       7 years  
Medical equipment held for sale or rental reserves 600,000   200,000 $ 600,000 200,000
Impairment of intangible assets   $ 0      
Capitalized internal-use software cost $ 3,500,000   $ 5,700,000 3,500,000 5,700,000
Amortization expense for capitalized software       $ 1,700,000 $ 400,000
Shares with anti-dilutive effect | shares       90,715 43,215
Software [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life Period       3 years  
Trade Names [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life Period       1 year  
Computers Equipment and Software [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives       3 years  
Stock Options [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Shares with anti-dilutive effect | shares       100,000 100,000
Capital Leases [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Weighted average interest rate under capital leases 5.10%     5.10%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of payors having greater than 10% of the Company's revenue | Customer       0 0
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Medicare [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk percentage       21.00% 32.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Blue Cross/Blue Shield affiliates [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk percentage       19.00% 18.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Medicare [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk percentage 5.00%   23.00%    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Blue Cross/Blue Shield affiliates [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk percentage 26.00%   31.00%    
Minimum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives       3 years  
Likelihood of tax benefit being sustained       50.00%  
Minimum [Member] | Physician and Customer Relationships [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life Period       15 years  
Minimum [Member] | Non-Compete Agreements [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life Period       2 years  
Minimum [Member] | Software Development [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives       3 years  
Maximum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives       7 years  
Maximum [Member] | Physician and Customer Relationships [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life Period       20 years  
Maximum [Member] | Non-Compete Agreements [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life Period       5 years  
Maximum [Member] | Software Development [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives       5 years  
Maximum [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk percentage       10.00% 10.00%