STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Valuation Assumptions

The assumptions used to estimate the per share fair value of stock options granted under the Share Incentive Plan were as follows:

	Three Months Ended March 31,
	2017	2016
Expected volatility	38 – 40%	36 - 44%
Dividend yield	0.0%	0.0%
Expected life	5.0 – 6.6 years	6.5 - 8.1 years
Risk-free interest rate	1.8 – 2.2%	1.5 - 2.1%

Stock-Based Compensation Expense

Compensation expense included in the Company’s Condensed Consolidated Statements of Comprehensive Loss for all stock-based compensation arrangements was as follows:

	Three Months Ended March 31,
	2017		2016
Cost of sales	$	2,286	$	1,562
R&D		11,494		13,707
SG&A		16,894		14,908
Total stock-based compensation expense	$	30,674	$	30,177