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THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) service_professional in Thousands, project in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) project service_professional | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) project service_professional operating_segment service_category | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Number of service categories | service_category |  |  | 500 |  |  |  |  |
Number of service professionals (over) | service_professional | 230 |  | 230 |  |  |  |  |
Number of projects (more than) | project | 25 |  | 25 |  |  |  |  |
Number of operating segments | operating_segment |  |  | 2 |  |  |  |  |
Revenue from contracts with customers | $ 389,913,000 | $ 357,358,000 | $ 1,108,624,000 | $ 1,004,697,000 |  |  |  |
Current deferred revenue | 58,169,000 |  | 58,169,000 |  |  | $ 58,220,000 |  |
Noncurrent deferred revenue | 100,000 |  | 100,000 |  |  | 200,000 |  |
Deferred revenue recognized during period |  |  | 55,700,000 | 58,500,000 |  |  |  |
Capitalized sales commissions where the customer relationship period is greater than one year | 52,200,000 |  | 52,200,000 |  |  | 39,100,000 |  |
Current capitalized sales commissions | 50,000,000.0 |  | 50,000,000.0 |  |  | 35,100,000 |  |
Non-current capitalized sales commissions | 2,200,000 |  | 2,200,000 |  |  | 4,000,000.0 |  |
Revenue reserve | 2,000,000.0 |  | 2,000,000.0 |  |  | 1,200,000 |  |
Allowance for doubtful accounts and revenue reserve | 29,787,000 |  | 29,787,000 |  |  | 20,293,000 |  |
Stockholders' equity | $ 1,283,761,000 | 1,332,451,000 | $ 1,283,761,000 | 1,332,451,000 | $ 1,301,926,000 | 1,323,552,000 | $ 1,344,546,000 | $ 1,321,987,000
Accounting Standards Update |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  | $ 0 |  |
ANGI Homeservices | Class B Common Stock | IAC |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Economic interest (as a percent) | 84.50% |  | 84.50% |  |  |  |  |
Voting interest (as a percent) | 98.20% |  | 98.20% |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ 20,800,000 |  | $ 51,300,000 |  |  |  |  |
United States |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ 368,082,000 | $ 335,230,000 | $ 1,041,903,000 | $ 934,409,000 |  |  |  |
Revenue | Geographic Concentration Risk | United States |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Concentration risk (as a percent) | 94.00% |  | 94.00% |  |  |  |  |

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