STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock-based compensation
Compensation expense	$ 1,572,000	$ 1,281,000	$ 4,546,000	$ 3,822,000
Total unrecognized compensation expense, net of estimated forfeitures	10,600,000		10,600,000
Average vesting period for recognition of unrecognized compensation expense			2 years 3 months 18 days
Cost of sales
Stock-based compensation
Compensation expense	11,000	10,000	32,000	32,000
Research and development expense
Stock-based compensation
Compensation expense	71,000	114,000	270,000	460,000
Selling, general and administrative expense
Stock-based compensation
Compensation expense	$ 1,490,000	$ 1,157,000	$ 4,244,000	$ 3,330,000