STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock-based compensation
Compensation expense	$ 3,253	$ 2,299	$ 6,066	$ 4,170
Total unrecognized compensation expense, net of estimated forfeitures	24,900		$ 24,900
Average vesting period for recognition of unrecognized compensation expense			2 years
Cost of sales
Stock-based compensation
Compensation expense	4	1	$ 5	13
Research and development expense.
Stock-based compensation
Compensation expense	46	51	183	104
Selling general and administrative expense
Stock-based compensation
Compensation expense	$ 3,203	$ 2,247	$ 5,878	$ 4,053

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 S99

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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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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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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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