STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock Based Compensation

Stock-based compensation expenses included in operating costs and expenses are as follows, in thousands:

	Three Months Ended March 31,
	2019		2018
Research and development	$	16,125	$	10,137
Selling, general and administrative		15,907		9,447
Total stock-based compensation	$	32,032	$	19,584