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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |  |  |
Fair value of shares withheld for tax withholding obligations |  |  | $ 11,031,000 |
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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