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COMMITMENTS AND CONTINGENCIES - Contingent Acquisition Obligations (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2019
Contingent Acquisition Obligations |  |
Remaining maximum amount of contingent consideration |  | $ 28,200
Payments for contingent consideration |  | 1,900
Beginning fair value |  | 15,713
Additions |  | 5,173
Change in fair value |  | (418)
Payments on contingent earn-out obligations |  | (3,891)
Ending fair value |  | $ 16,577
Mr. Chopra, Chief Executive Officer | Deferred bonus |  |
Indemnifications and Certain Employment-Related Contingencies |  |
Bonus payment on or within 45 days of January 1, 2024 contingent upon continued employment through that date | $ 13,500 |
Maximum number of days after January 1, 2024, bonus payment due | 45 days |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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