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, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property and equipment $ 74,024 $ 64,294
Accumulated depreciation 45,794 44,856
Property and equipment, net 28,230 19,438
Rental equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 46,953 39,308
Accumulated depreciation 30,283 30,984
Property and equipment, net 16,670 8,324
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 27,071 24,986
Accumulated depreciation 15,511 13,872
Property and equipment, net $ 11,560 $ 11,114