STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE (Tables)

6 Months Ended

Jun. 30, 2012

Stockholders Equity And Share Based Compensation Expense [Abstract]

Share-based compensation expense

The Company recognized share-based compensation expense as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Costs of sales	$	340	$	282	$	712	$	573
Research and development		306		511		673		1,038
Selling, general and administrative		9,560		1,013		11,213		2,763
Total share-based compensation expense	$	10,206	$	1,806	$	12,598	$	4,374

Fair value of options estimated at the date of grant with weighted-average assumptions

The fair value of options was estimated at the date of grant using the Black Scholes Merton option pricing model with the following weighted‑average assumptions:

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Risk free interest rate		0.7	%		1.8	%		0.8	%		2.2	%
Expected dividend yield		0.0	%		0.0	%		0.0	%		0.0	%
Expected volatility		67	%		67	%		67	%		67	%
Expected option term (in years)		4.6			4.5			4.6			4.5

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

During the three and six months ended June 30, 2012, the fair value of shares under the ESPP was estimated using the following assumptions:

Risk free interest rate	0.1%
Expected dividend yield	0.0%
Expected volatility	67%
Expected term (in years)	0.8