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, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Property and equipment $ 67,215 $ 66,273
Accumulated depreciation 42,016 35,593
Property and equipment, net 25,199 30,680
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 54,582 54,677
Accumulated depreciation 33,937 28,894
Property and equipment, net 20,645 25,783
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 12,633 11,596
Accumulated depreciation 8,079 6,699
Property and equipment, net $ 4,554 $ 4,897