Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Depreciation and Amortization Expense of Property and Equipment and Rental Equipment (Details)

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Summary of Significant Accounting Policies - Summary of Depreciation and Amortization Expense of Property and Equipment and Rental Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 3,539 $ 3,148 $ 10,404 $ 8,654
Equipment        
Property Plant And Equipment [Line Items]        
Depreciation 3,029 2,752 8,929 7,512
Other property and equipment        
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 510 $ 396 $ 1,475 $ 1,142