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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |  |  |
Fair value of shares withheld for tax withholding obligations |  |  | $ 4,871,000 | $ 5,337,000 | $ 2,844,000
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) | 27,967 | 35,205 |  |  |
Employees [Member] |  |  |  |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |  |  |
Fair value of shares issued | $ 1,100,000 | $ 967,000 |  |  |
Shares withheld for tax withholding obligations (in shares) | 8,106 | 9,565 |  |  |
Fair value of shares withheld for tax withholding obligations | $ 410,000 | $ 346,000 |  |  |
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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