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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible Assets and Goodwill [Line Items] |  |  |  |
Amortization of intangibles |  | $ 5,267 | $ 6,083 | $ 6,663
Intangible Assets, Net[Abstract] |  |  |  |
Total intangible assets, Gross |  | 60,251 | 59,911 |
Accumulated amortization |  | (39,099) | (34,492) |
Total Finite Lived Intangible Assets, Net | [1] | 15,201 |  |
Total Intangible Assets, Net |  | $ 21,152 | 25,419 |
Minimum [Member] |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |
Useful life (in years) |  | 2 years |  |
Maximum [Member] |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |
Useful life (in years) |  | 12 years |  |
Developed technology |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 33,270 | 33,270 |
Accumulated amortization |  | (22,464) | (19,211) |
Total Finite Lived Intangible Assets, Net |  | 10,806 | 14,059 |
Customer relationships [Member] |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 20,030 | 20,030 |
Accumulated amortization |  | (16,520) | (14,621) |
Total Finite Lived Intangible Assets, Net |  | 3,510 | 5,409 |
Technology licenses [Member] |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 1,000 | 0 |
Accumulated amortization |  | (115) | 0 |
Total Finite Lived Intangible Assets, Net |  | 885 | 0 |
Leases, Acquired-in-Place [Member] |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 0 | 660 |
Accumulated amortization |  | 0 | (660) |
Total Finite Lived Intangible Assets, Net |  | 0 | 0 |
Domain name |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |
Indefinite-lived intangible assets |  | 1,261 | 1,261 |
In Process Research and Development [Member] |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |
Finite-lived intangible assets |  | 4,690 |  |
Intangible Assets, Net[Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 4,690 | 4,690 |
Total Finite Lived Intangible Assets, Net |  | $ 4,690 | $ 4,690 |
[1] | The total above excludes $4.7 million of in-process R&D which will be amortized upon completion of development over the estimated useful life of the technology.

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