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
Mar. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Property and equipment $ 67,186 $ 66,273
Accumulated depreciation 37,542 35,593
Property and equipment, net 29,644 30,680
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 54,876 54,677
Accumulated depreciation 30,365 28,894
Property and equipment, net 24,511 25,783
Other property and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 12,310 11,596
Accumulated depreciation 7,177 6,699
Property and equipment, net $ 5,133 $ 4,897