The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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=6415400&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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.

+ 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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Weighted average remaining contractual term for option awards outstanding, 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
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STOCKHOLDERS' EQUITY - Summary of Stock Options Outstanding (Details 3) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Number of shares	2,237,317
Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Number of shares	2,237,000	1,679,000	1,346,000
Outstanding, Weighted average remaining contractual life (in years)	7 years
Outstanding, Weighted average exercise price	$ 4.16	$ 4.74	$ 5.35
Exercisable, Number of shares	1,516,000
Exercisable, Weighted average exercise price	$ 4.83
Stock Option \| $0.00 - $10.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum	0.00
Range of exercise prices, maximum	$ 10.00
Outstanding, Number of shares	2,043,000
Outstanding, Weighted average remaining contractual life (in years)	7 years 6 months
Outstanding, Weighted average exercise price	$ 2.73
Exercisable, Number of shares	1,322,000
Exercisable, Weighted average exercise price	$ 2.72
Stock Option \| $10.01 - $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum	10.01
Range of exercise prices, maximum	$ 20.00
Outstanding, Number of shares	110,000
Outstanding, Weighted average remaining contractual life (in years)	1 year 5 months 1 day
Outstanding, Weighted average exercise price	$ 15.50
Exercisable, Number of shares	110,000
Exercisable, Weighted average exercise price	$ 15.50
Stock Option \| $20.01 - $30.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum	20.01
Range of exercise prices, maximum	$ 30.00
Outstanding, Number of shares	82,000
Outstanding, Weighted average remaining contractual life (in years)	3 years
Outstanding, Weighted average exercise price	$ 23.57
Exercisable, Number of shares	82,000
Exercisable, Weighted average exercise price	$ 23.57
Stock Option \| $30.01 - $41.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum	30.01
Range of exercise prices, maximum	$ 41.00
Outstanding, Number of shares	2,000
Outstanding, Weighted average remaining contractual life (in years)	1 year 3 months 18 days
Outstanding, Weighted average exercise price	$ 41.00
Exercisable, Number of shares	2,000
Exercisable, Weighted average exercise price	$ 41.00