STOCKHOLDER'S EQUITY AND STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Options Activity

The following table summarizes stock option and RSU activity for the period ended September 30, 2015:

	Number of Options		Number of RSUs
Outstanding as of December 31, 2014	11,587,079		486,174
Granted/Awarded	4,090,351		241,250
Options Exercised/Shares Issued	(1,767,097	)	(153,177	)
Cancelled	(133,648	)	(13,708	)
Outstanding as of September 30, 2015	13,776,685		560,539
Exercisable as of September 30, 2015	7,461,978		—

Stock Compensation Expense

The following table reflects stock compensation expense recorded, net of amounts capitalized into inventory:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Compensation expense related to:
Equity Incentive Plan	$	5,782	$	1,952	$	13,374	$	5,117
Employee Stock Purchase Plan	87		90		221		177
	$	5,869	$	2,042	$	13,595	$	5,294
Stock-based compensation expense charged to:
Research and development	$	1,662	$	794	$	4,381	$	2,021
Selling, general and administrative	$	4,207	$	1,248	$	9,214	$	3,273