STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Stock-based compensation
Compensation expense	$ 2,813,000	$ 1,871,000
Total unrecognized compensation expense, net of estimated forfeitures	22,900,000
Average vesting period for recognition of unrecognized compensation expense	2 years
Cost of sales
Stock-based compensation
Compensation expense	1,000	12,000
Research and development expense.
Stock-based compensation
Compensation expense	137,000	53,000
Selling general and administrative expense
Stock-based compensation
Compensation expense	$ 2,675,000	$ 1,806,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Section S99

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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- Definition

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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