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ACQUISITIONS (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 11, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Purchase price of acquired company | [1] |  | $ 800 | $ 297 | $ 49,113
OpenSpan, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price of acquired company |  | $ 48,800 |  |  |
Cash acquired from acquisition |  | $ 1,800 |  |  |
[1] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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