Stock-Based Compensation

Total stock-based compensation expense included in our Consolidated Statements of Operations is presented in the following table:



	Three Months Ended				Six Months Ended
(In thousands)	June 29, 2019		June 30, 2018		June 29, 2019		June 30, 2018
Cost of products sold	$	327	$	196	$	529	$	433
Research and development	1,246		837		2,371		2,044
Selling, general, and administrative	2,396		1,367		4,755		4,723
Total stock-based compensation	$	3,969	$	2,400	$	7,655	$	7,200

Market-Based and Performance-Based Stock Compensation

In fiscal years 2019 and 2018, we granted various awards of RSUs with either a market condition or a performance condition to certain executives. We have not modified the conditions for the vesting of these awards, or our policy for valuing them, from that disclosed in "Note 17 - Stock-Based Compensation Plans" in our 2018 10-K. For these awards, we incurred stock compensation expense of approximately $1.1 million and $0.2 million in the second quarter of fiscal 2019 and fiscal 2018, respectively, and of approximately $2.0 million and $0.5 million in the first six months of fiscal 2019 and fiscal 2018, respectively, which is recorded as a component of total stock-based compensation expense.

The following table summarizes the activity for our awards with a market or performance condition during the first six months of fiscal 2019:



(Shares in thousands)	Unvested		Vested	Total
Balance, December 29, 2018	909		—	909
Granted	265		—	265
Canceled	(106	)	—	(106	)
Balance, June 29, 2019	1,068		—	1,068