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BUSINESS ACQUISITONS - ANOVA DATA, INC (Details) - USD ($) $ in Thousands, shares in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Shares of common stock issued as purchase consideration | $ 15,200 |  |  |
Goodwill |  | $ 224,896 | $ 383,655 | $ 335,716
Anova Data, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares issued to selling shareholders (in shares) | 2.9 |  |  |
Number of additional shares potentially issued (in number of shares) | 0.3 |  |  |
Fair value of additional shares potentially issued | $ 1,700 |  |  |
Fair value of total consideration | 16,900 |  |  |
Finite-lived intangibles | 11,200 |  |  |
Net assets acquired | 200 |  |  |
Goodwill |  | $ 5,500 |  |
Weighted average life of identifiable intangible assets (in years) |  | 6 years 3 months |  |
Customer relationships | Anova Data, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Adjustments to acquired intangibles |  | $ (2,000) |  |
Finite-lived intangibles | 5,200 |  |  |
Developed technology | Anova Data, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Adjustments to acquired intangibles |  | $ 2,000 |  |
Finite-lived intangibles | $ 6,000 |  |  |

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