STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock-based compensation
Compensation expense	$ 2,299,000	$ 1,562,000	$ 4,170,000	$ 2,973,000
Total unrecognized compensation expense, net of estimated forfeitures	15,000,000		15,000,000
Average vesting period for recognition of unrecognized compensation expense			2 years 2 months 12 days
Cost of sales
Stock-based compensation
Compensation expense	1,000	11,000	13,000	21,000
Research and development expense
Stock-based compensation
Compensation expense	51,000	89,000	104,000	199,000
Selling, general and administrative expense
Stock-based compensation
Compensation expense	$ 2,247,000	$ 1,462,000	$ 4,053,000	$ 2,753,000