Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, net (Details)

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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 61,298   $ 61,298   $ 58,510
Accumulated depreciation (39,734)   (39,734)   (36,439)
Total 21,564   21,564   22,071
Depreciation 2,000 $ 1,100 4,400 $ 3,400  
Land          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 1,828   1,828   2,815
Buildings          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,900   4,900   5,096
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,630   4,630   3,295
Equipment and furniture          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 24,896   24,896   25,612
Computer software and hardware          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 12,647   12,647   9,760
Demonstration and loaned equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 12,397   $ 12,397   $ 11,932