Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.3.1.900
Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
Mar. 31, 2014
Dec. 31, 2015
USD ($)
Financial_Institutions
Customer
Segment
shares
Dec. 31, 2014
USD ($)
Customer
$ / shares
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  
Liquid Investments with original maturities period     Three months or less  
Estimated obsolete inventory     $ 100,000 $ 100,000
Medical equipment in rental services useful life     7 years  
Medical equipment held for sale or rental reserves     $ 200,000 100,000
Estimated useful lives   5 years 7 years  
Impairment of intangible assets $ 0      
Capitalized internal-use software cost     $ 5,600,000 3,400,000
Amortization expense for capitalized software     $ 400,000 $ 0
Shares with anti-dilutive effect | shares     43,215 45,267
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     4.80%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Number of payors having greater than 9% 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     32.00% 30.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Blue Cross/Blue Shield affiliates [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk percentage     18.00% 18.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Medicare [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk percentage     20.00% 18.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Blue Cross/Blue Shield affiliates [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk percentage     27.00% 26.00%
Property Plant And Equipment By Estimated Useful Life [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Decrease in depreciation expense due to change in estimated useful lives       $ 1,900,000
After tax impact to net income due to change in estimated useful life       $ 1,100,000
Impact to basic income per share due to change in estimated useful lives | $ / shares       $ 0.05
Impact to diluted income per share due to change in estimated useful lives | $ / shares       $ 0.05
Minimum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful lives     3 years  
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     9.00% 9.00%
Greater Than [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Likelihood of tax benefit being sustained     50.00%