Annual report pursuant to Section 13 and 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
Dec. 31, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Property and equipment $ 66,273 $ 57,767
Accumulated depreciation 35,593 25,840
Property and equipment, net 30,680 31,927
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 54,677 48,359
Accumulated depreciation 28,894 21,084
Property and equipment, net 25,783 27,275
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 11,596 9,408
Accumulated depreciation 6,699 4,756
Property and equipment, net $ 4,897 $ 4,652