Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details)

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Summary of Significant Accounting Policies - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Property and equipment $ 65,584 $ 57,767
Accumulated depreciation 33,875 25,840
Property and equipment, net 31,709 31,927
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 54,369 48,359
Accumulated depreciation 27,662 21,084
Property and equipment, net 26,707 27,275
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 11,215 9,408
Accumulated depreciation 6,213 4,756
Property and equipment, net $ 5,002 $ 4,652