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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] |
(in thousands) | Goodwill
Balance at December 31, 2015 | $ | 91,849 |
Goodwill acquired during the period | — |
Balance at December 31, 2016 | 91,849 |
Goodwill acquired during the period | — |
Balance at December 31, 2017 | $ | 91,849 |
Schedule of intangible assets [Table Text Block] | The Company does not believe there is any significant residual value associated with the following intangible assets:
| December 31, 2017 |  | December 31, 2016
(in thousands) | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net
Domain name | $ | 1,261 |  |  | $ | — |  |  | $ | 1,261 |  |  | $ | 1,261 |  |  | $ | — |  |  | $ | 1,261 |
In-process research and development | 4,690 |  |  | — |  |  | 4,690 |  |  | 4,690 |  |  | — |  |  | 4,690 |
Developed technology | 33,270 |  |  | (19,211 | ) |  | 14,059 |  |  | 33,270 |  |  | (15,455 | ) |  | 17,815 |
Customer relationships | 20,030 |  |  | (14,621 | ) |  | 5,409 |  |  | 20,030 |  |  | (12,474 | ) |  | 7,556 |
Technology licenses | — |  |  | — |  |  | — |  |  | 3,000 |  |  | (3,000 | ) |  | — |
In-place leases | 660 |  |  | (660 | ) |  | — |  |  | 660 |  |  | (480 | ) |  | 180 |
Total intangible assets | $ | 59,911 |  |  | $ | (34,492 | ) |  | $ | 25,419 |  |  | $ | 62,911 |  |  | $ | (31,409 | ) |  | $ | 31,502 |
Schedule of expected amortization expense [Table Text Block] | The estimated future amortization expense related to definite-lived intangible assets at December 31, 2017, is as follows:
Fiscal Year | Estimated Amortization (in thousands)
2018 | $ | 5,152 |
2019 | 4,753 |
2020 | 3,528 |
2021 | 2,662 |
2022 | 1,584 |
Thereafter | 1,789 |
Total (1) | $ | 19,468 |
_______________
(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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