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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement - Additional Information (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |
Fair value of shares withheld for tax withholding obligations | $ 9,330,000 |
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) | 5,590 | 27,967
Employees [Member] |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |
Fair value of shares issued | $ 165,000 | $ 1,100,000
Shares withheld for tax withholding obligations (in shares) | 605 | 8,106
Fair value of shares withheld for tax withholding obligations | $ 55,000 | $ 410,000
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 The total fair value of shares issued during the period under a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares issued pursuant to the terms of a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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