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THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Revenue and Other [Line Items] |  |  |
Goodwill impairment | $ 211,973 | $ 0 | $ 3,318
Impairment of equity securities without readily determinable fair value | (51,500) |  |
Write-off of notes receivable | (7,500) |  |
Consolidated revenue | 1,228,765 | 1,105,843 |
Current deferred revenue | 433,728 |  | 397,490
Non-current deferred revenue | 1,300 |  | 1,300
Deferred revenue recognized during period | 258,200 | 234,800 |
Capitalized sales commissions where customer relationship period is greater than one year | 47,500 |  | 42,400
Accounts receivable related to revenue earned | 375,854 |  | 298,334
Applications |  |  |
Revenue and Other [Line Items] |  |  |
Goodwill impairment | 211,973 |  | 0
Emerging & Other |  |  |
Revenue and Other [Line Items] |  |  |
Goodwill impairment |  |  | 3,318
Google Inc. | Revenue | Customer concentration risk |  |  |
Revenue and Other [Line Items] |  |  |
Consolidated revenue | $ 138,900 | $ 195,800 |
Concentration risk (as a percent) | 11.00% | 18.00% |
Google Inc. | Revenue | Customer concentration risk | Applications |  |  |
Revenue and Other [Line Items] |  |  |
Consolidated revenue | $ 46,100 | $ 88,100 |
Google Inc. | Revenue | Customer concentration risk | Emerging & Other |  |  |
Revenue and Other [Line Items] |  |  |
Consolidated revenue | 80,500 | $ 94,800 |
Google Inc. | Accounts Receivable | Customer concentration risk |  |  |
Revenue and Other [Line Items] |  |  |
Accounts receivable related to revenue earned | $ 48,700 |  | 53,000
Match Group |  |  |
Revenue and Other [Line Items] |  |  |
Economic interest (as a percent) | 80.40% |  |
Voting interest (as a percent) | 97.40% |  |
ANGI Homeservices |  |  |
Revenue and Other [Line Items] |  |  |
Economic interest (as a percent) | 84.90% |  |
Voting interest (as a percent) | 98.30% |  |
Desktop | Applications |  |  |
Revenue and Other [Line Items] |  |  |
Goodwill impairment | $ 211,973 |  | $ 0
Impairment of indefinite-lived intangible assets | 21,400 |  |
Revenue Change | Handy |  |  |
Revenue and Other [Line Items] |  |  |
Consolidated revenue | $ 15,200 |  |

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