STOCK-BASED COMPENSATION - SCHEDULE OF INFORMATION FOR STOCK OPTIONS OUTSTANDING AND EXERCISABLE (Details) shares in Thousands	12 Months Ended
Dec. 31, 2017 $ / shares shares
Awards Outstanding
Options outstanding (shares) \| shares	47,115
Weighted-average remaining contractual life	7 years 1 month 6 days
Weighted-average exercise price (USD per share)	$ 3.25
Awards Exercisable
Options exercisable (shares) \| shares	17,358
Weighted-average remaining contractual life	4 years 8 months 12 days
Weighted-average exercise price (USD per share)	$ 2.22
$0.01 to $3.00
Awards Outstanding
Options outstanding (shares) \| shares	26,143
Weighted-average remaining contractual life	6 years
Weighted-average exercise price (USD per share)	$ 1.32
Awards Exercisable
Options exercisable (shares) \| shares	15,462
Weighted-average remaining contractual life	4 years 9 months 18 days
Weighted-average exercise price (USD per share)	$ 0.99
Exercise price range, lower limit (USD per share)	0.01
Exercise price range, upper limit (USD per share)	$ 3.00
$3.01 to $6.00
Awards Outstanding
Options outstanding (shares) \| shares	17,580
Weighted-average remaining contractual life	9 years 1 month 6 days
Weighted-average exercise price (USD per share)	$ 4.54
Awards Exercisable
Options exercisable (shares) \| shares	50
Weighted-average remaining contractual life	6 years 6 months
Weighted-average exercise price (USD per share)	$ 5.82
Exercise price range, lower limit (USD per share)	3.01
Exercise price range, upper limit (USD per share)	$ 6.00
$6.01 to $9.00
Awards Outstanding
Options outstanding (shares) \| shares	1,210
Weighted-average remaining contractual life	5 years 6 months
Weighted-average exercise price (USD per share)	$ 7.66
Awards Exercisable
Options exercisable (shares) \| shares	711
Weighted-average remaining contractual life	4 years 1 month 6 days
Weighted-average exercise price (USD per share)	$ 7.68
Exercise price range, lower limit (USD per share)	6.01
Exercise price range, upper limit (USD per share)	$ 9.00
$9.01 to $12.00
Awards Outstanding
Options outstanding (shares) \| shares	950
Weighted-average remaining contractual life	9 years
Weighted-average exercise price (USD per share)	$ 10.57
Awards Exercisable
Options exercisable (shares) \| shares	202
Weighted-average remaining contractual life	6 years 3 months 18 days
Weighted-average exercise price (USD per share)	$ 9.92
Exercise price range, lower limit (USD per share)	9.01
Exercise price range, upper limit (USD per share)	$ 12.00
$12.01 to $15.00
Awards Outstanding
Options outstanding (shares) \| shares	718
Weighted-average remaining contractual life	5 years 7 months 6 days
Weighted-average exercise price (USD per share)	$ 13.12
Awards Exercisable
Options exercisable (shares) \| shares	420
Weighted-average remaining contractual life	3 years
Weighted-average exercise price (USD per share)	$ 13.34
Exercise price range, lower limit (USD per share)	12.01
Exercise price range, upper limit (USD per share)	$ 15.00
$15.01 to $18.00
Awards Outstanding
Options outstanding (shares) \| shares	239
Weighted-average remaining contractual life	6 months
Weighted-average exercise price (USD per share)	$ 17.71
Awards Exercisable
Options exercisable (shares) \| shares	238
Weighted-average remaining contractual life	4 months 24 days
Weighted-average exercise price (USD per share)	$ 17.72
Exercise price range, lower limit (USD per share)	15.01
Exercise price range, upper limit (USD per share)	$ 18.00
$18.01 to $21.00
Awards Outstanding
Options outstanding (shares) \| shares	192
Weighted-average remaining contractual life	5 years 2 months 12 days
Weighted-average exercise price (USD per share)	$ 19.88
Awards Exercisable
Options exercisable (shares) \| shares	192
Weighted-average remaining contractual life	5 years 2 months 12 days
Weighted-average exercise price (USD per share)	$ 19.88
Exercise price range, lower limit (USD per share)	18.01
Exercise price range, upper limit (USD per share)	$ 21.00
$21.01 to $24.00
Awards Outstanding
Options outstanding (shares) \| shares	83
Weighted-average remaining contractual life	4 years 9 months 18 days
Weighted-average exercise price (USD per share)	$ 22.51
Awards Exercisable
Options exercisable (shares) \| shares	83
Weighted-average remaining contractual life	4 years 9 months 18 days
Weighted-average exercise price (USD per share)	$ 22.51
Exercise price range, lower limit (USD per share)	21.01
Exercise price range, upper limit (USD per share)	$ 24.00

Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable [Abstract]

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Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Abstract]

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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