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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |
Fair value of shares withheld for tax withholding obligations | $ 11,620,000 | $ 9,432,000 | $ 4,871,000
Employees and Non Employee Members of Scientific Advisory Board [Member] |  |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |
Shares issued (in shares) | 2,456 | 5,590 |
Employees [Member] |  |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |
Fair value of shares issued | $ 0 | $ 165,000 |
Shares withheld for tax withholding obligations (in shares) |  | 605 |
Fair value of shares withheld for tax withholding obligations |  | $ 55,000 |
Members of Scientific Advisory Board [Member] |  |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |
Fair value of shares issued | $ 300,000 | $ 300,000 |

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- Definition Number of shares issued pursuant to the terms of a deferred compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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