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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Intangible Assets, Gross |  | $ 60,251 | $ 59,911
Finite-Lived Intangible Assets, Accumulated Amortization |  | (37,799) | (34,492)
Total |  | 22,452 | 25,419
Finite-Lived Intangible Assets, Net | [1] | 16,501 |
Developed technology |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 33,270 | 33,270
Finite-Lived Intangible Assets, Accumulated Amortization |  | (21,651) | (19,211)
Finite-Lived Intangible Assets, Net |  | 11,619 | 14,059
Customer relationships |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 20,030 | 20,030
Finite-Lived Intangible Assets, Accumulated Amortization |  | (16,065) | (14,621)
Finite-Lived Intangible Assets, Net |  | 3,965 | 5,409
Technology licenses |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 1,000 | 0
Finite-Lived Intangible Assets, Accumulated Amortization |  | (83) | 0
Finite-Lived Intangible Assets, Net |  | 917 | 0
In-place leases |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 0 | 660
Finite-Lived Intangible Assets, Accumulated Amortization |  | 0 | (660)
Finite-Lived Intangible Assets, Net |  | 0 | 0
Domain name |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Indefinite-Lived Intangible Assets |  | 1,261 | 1,261
In-process research and development |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Indefinite-Lived Intangible Assets |  | $ 4,690 | $ 4,690
[1] | The total above excludes $4.7 million of in-process research and development that will be amortized, upon completion of development, over the estimated useful life of the technology.

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