Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details)

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Balance Sheet Components - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property and equipment $ 66,911 $ 64,294
Accumulated depreciation 45,381 44,856
Property and equipment, net 21,530 19,438
Rental equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 40,614 39,308
Accumulated depreciation 30,678 30,984
Property and equipment, net 9,936 8,324
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 26,297 24,986
Accumulated depreciation 14,703 13,872
Property and equipment, net $ 11,594 $ 11,114