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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Contingent Consideration Arrangements |  |
Contingent Consideration Arrangements |  |
Balance at beginning of period | $ 6,918 | $ (28,631)
Fair value adjustments | 6,282 | (1,529)
Included in other comprehensive loss | 0 | (14)
Fair value at date of acquisition | (1,000) | 0
Settlements | 1,000 | 1,988
Balance at end of period | 636 | $ (28,186)
Warrant |  |
Warrant |  |
Balance at beginning of period | 8,495 |
Fair value adjustments | (2,006) |
Included in other comprehensive loss | 0 |
Fair value at date of acquisition | 0 |
Settlements | 0 |
Balance at end of period | $ 6,489 |

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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