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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 3,442 $ 2,887 $ 6,865 $ 5,506
Equipment        
Property Plant And Equipment [Line Items]        
Depreciation 2,944 2,503 5,900 4,760
Other property and equipment        
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 498 $ 384 $ 965 $ 746