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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 | $ 124,394 |  | $ 124,394 |  | $ 98,906
Less: accumulated depreciation and amortization | (73,113) |  | (73,113) |  | (59,505)
Property and equipment, net | 51,281 |  | 51,281 |  | 39,401
Depreciation and amortization expense | 5,100 | $ 4,400 | 14,700 | $ 12,000 |
Computer equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment | 70,158 |  | 70,158 |  | 57,295
Computer software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment | 20,254 |  | 20,254 |  | 19,716
Furniture, fixtures and equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment | 4,025 |  | 4,025 |  | 3,425
Scanner appliances |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment | 14,419 |  | 14,419 |  | 14,776
Scanner appliances and other computer equipment subject to subscription |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment, net | 7,700 |  | 7,700 |  | 8,300
Scanner appliances and other computer equipment not placed in service |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment | 1,700 |  | 1,700 |  | 1,300
Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment | $ 15,538 |  | $ 15,538 |  | $ 3,694

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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