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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Intangible Assets, Gross |  | $ 60,502 | $ 60,251
Finite-Lived Intangible Assets, Accumulated Amortization |  | (41,582) | (39,099)
Total |  | 18,920 | 21,152
Finite-Lived Intangible Assets, Net | [1] | 12,969 |
Developed technology |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 33,270 | 33,270
Finite-Lived Intangible Assets, Accumulated Amortization |  | (24,052) | (22,464)
Finite-Lived Intangible Assets, Net |  | 9,218 | 10,806
Customer relationships |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 20,030 | 20,030
Finite-Lived Intangible Assets, Accumulated Amortization |  | (17,342) | (16,520)
Finite-Lived Intangible Assets, Net |  | 2,688 | 3,510
Technology licenses |  |  |
Schedule of Intangible Assets [Table] [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 1,251 | 1,000
Finite-Lived Intangible Assets, Accumulated Amortization |  | (188) | (115)
Finite-Lived Intangible Assets, Net |  | 1,063 | 885
Internet Domain Names [Member] |  |  |
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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