EQUITY AND CASH COMPENSATION UNDER THE PPG INDUSTRIES AGREEMENTS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Long-term Purchase Commitment [Line Items]
Minimum average closing price of common stock (in dollars per share)	$ 20.00		$ 20.00
Issuance of common stock in connection with materials and license agreements (in shares)				181
Charges to expense for issuance of common stock in connection with materials and license agreements				$ 9,000
Charges to expense for cash portion of reimbursement of expenses	$ 1,100,000	$ 1,000,000	$ 2,400,000	$ 2,400,000
Development Agreement [Member]
Long-term Purchase Commitment [Line Items]
Time period (in years)	five-year
Supply Agreement [Member]
Long-term Purchase Commitment [Line Items]
Time period (in years)	seven-year