Stock-based Compensation

6 Months Ended

Jun. 30, 2016

Stock Incentive Plans

The Company has a stock-based compensation program that provides equity incentives for employees, consultants and directors. This program includes incentive and non-statutory stock options and nonvested stock awards (referred to as restricted stock unit awards) administered by the Compensation Committee of the Company's Board of Directors.

Under the stock-based compensation program, the Company has granted time-based options, time-based restricted stock unit awards, performance-based restricted stock unit awards and market-based restricted stock unit awards. Options generally expire ten years from their grant dates. Time-based options and restricted stock unit awards generally vest over a three year period. Shares issuable under the performance-based restricted stock unit awards are earned based upon the Company's return on invested capital over a three year period. Shares issuable under market-based restricted stock unit awards are earned based upon the Company's total shareholder return compared to the total shareholder return over a three year period of the component company at the 60th percentile level in the Standard & Poor's 500 Index. Shares vested under the performance-based restricted stock unit awards and the market-based restricted stock unit awards must be held by the participant for a period of one year from the vest date.

Employee Stock Purchase Plan

The Company has an Employee Stock Purchase Plan (the “ESPP”) which allows employees to purchase shares of the Company’s common stock at 85 percent of the lower of the fair market value at the date of enrollment or the fair market value at the purchase date. The ESPP provides for six-month offerings commencing on May 1 and November 1 of each year with purchases on April 30 and October 31 of each year. Shares purchased under the ESPP must be held by the purchasing plan participant for a period of at least 18 months after the date of purchase.


Note 2.	Stock-based Compensation - (Continued)

Stock-based Compensation Expense

Stock-based compensation expense recognized in the Consolidated Statements of Income are as follows (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Cost of goods sold	$	855	$	766	$	1,470	$	1,484
Research and development	1,233		1,185		2,414		2,325
Selling, general and administrative	6,205		6,229		10,497		9,129
Stock-based compensation expense	$	8,293	$	8,180	$	14,381	$	12,938

Stock-based compensation costs capitalized in inventory are as follows (in thousands):



	June 30,
	2016	2015
Capitalized in inventory	685	703

As of June 30, 2016, the Company had $53.6 million of total unrecognized stock-based compensation costs, net of estimated forfeitures, to be recognized over a weighted average period of 2.2 years.