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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |  |  |  |  |
Fair value of shares withheld for tax withholding obligations |  |  |  | $ 5,337 | $ 2,844 |  |
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) | 35,205 | 31,301 | 22,586 |  |  |  |
Employees [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |  |  |  |  |
Fair value of shares issued |  |  |  |  | $ 967 | $ 749 | $ 435
Shares withheld for tax withholding obligations (in shares) |  |  |  | 9,565 | 8,071 | 4,672 |
Fair value of shares withheld for tax withholding obligations |  |  |  | $ 346 | $ 271 | $ 154 |
Non Employee 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 | $ 323 | $ 300

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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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