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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) - USD ($) shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2019
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 72,858 | $ 72,952 |  |
Goodwill, acquired during period |  | 6,179 | 0 |  |
Currency translation adjustments |  | 2 | (94) |  |
Ending balance |  | 79,039 | 72,858 | $ 72,952 |
Business Acquisition [Line Items] |  |  |  |  |
Payments for acquisitions, net of cash acquired |  | 10,934 | 800 | 297 |
Goodwill |  | $ 72,858 | $ 72,858 | $ 72,952 |
In The Chat Communications Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments for acquisitions, net of cash acquired | $ 10,900 |  |  |  |
retention based bonus (in shares) | 15 |  |  |  |
Technology | In The Chat Communications Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Technology intangible assets |  |  |  |  | $ 5,100
Goodwill | In The Chat Communications Inc. |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Ending balance | $ 6,200 |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 6,200 |  |  |  | $ 6,200

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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