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
Jun. 30, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Property and equipment $ 63,260 $ 57,767
Accumulated depreciation 31,086 25,840
Property and equipment, net 32,174 31,927
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 52,597 48,359
Accumulated depreciation 25,383 21,084
Property and equipment, net 27,214 27,275
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 10,663 9,408
Accumulated depreciation 5,703 4,756
Property and equipment, net $ 4,960 $ 4,652