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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 54,809   $ 54,809   $ 49,352
Accumulated depreciation (33,956)   (33,956)   (32,019)
Total 20,853   20,853   17,333
Depreciation 1,200 $ 900 2,300 $ 1,900  
Land [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 2,845   2,845   2,856
Buildings [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 5,234   5,234   5,219
Leasehold improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,936   3,936   2,386
Office furniture and equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 21,812   21,812   18,398
Computer software and hardware [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 9,250   9,250   9,100
Demonstration and loaned equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 11,732   $ 11,732   $ 11,393