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STOCK PLANS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 30, 2014
Stock Incentive Plans
Awards Reserved for Issuance (in shares)	12,129,537
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	4,000,000
Employee Stock Purchase Plan (ESPP), Shares in ESPP	500,000
Maximum Fair Market Value Purchase of ESPP Shares	$ 25,000
Employee Stock Purchase Plan fair value	85.00%
Awards Issued (in shares)	9,113,060
Awards Available for Grant (in shares)	3,016,477
Employee Stock Purchase Plan, Number of Shares Authorized	500,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans	160,147
Employee Stock Purchase Plan, Number of Shares Available For Purchase	339,853
Stock options
Stock Incentive Plans
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 41,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 7 months 25 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 20.78	$ 19.13	$ 37.82
Restricted Stock Units (RSUs) [Member]
Stock Incentive Plans
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 10 months 7 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 19,100,000
Inducement Plan 2014 [Member]
Stock Incentive Plans
Awards Reserved for Issuance (in shares)	175,000			175,000
Awards Issued (in shares)	52,276
Awards Available for Grant (in shares)	122,724
Two Thousand Seven Stock Incentive Plan [Member]
Stock Incentive Plans
Awards Reserved for Issuance (in shares)	2,022,837
Awards Issued (in shares)	2,022,837
Awards Available for Grant (in shares)	0
Stock Incentive Plan 2011 [Member]
Stock Incentive Plans
Awards Reserved for Issuance (in shares)	9,931,700
Awards Issued (in shares)	7,037,947
Awards Available for Grant (in shares)	2,893,753

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Employee Stock Purchase Plan (ESPP), Shares in ESPP

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Employee Stock Purchase Plan, Number of Shares Authorized

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Employee Stock Purchase Plan, Number of Shares Available For Purchase

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The percentage of fair value of common stock eligible employees can purchase common shares at through an employee stock purchase plan.

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of share instruments newly issued under a share-based compensation plan.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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