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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 54,244   $ 54,244   $ 49,352
Accumulated depreciation (33,567)   (33,567)   (32,019)
Total 20,677   20,677   17,333
Depreciation 1,100 $ 900 3,400 $ 2,900  
Land          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 2,833   2,833   2,856
Buildings          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 5,205   5,205   5,219
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,706   3,706   2,386
Equipment and furniture          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 20,987   20,987   18,398
Computer software and hardware          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 9,648   9,648   9,100
Demonstration and loaned equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 11,865   $ 11,865   $ 11,393