Common Shares and Share-Based Compensation (Tables)

3 Months Ended

Apr. 02, 2021

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Share-Based Compensation Expense Recorded in the Consolidated Statements of Operations

The table below summarizes share-based compensation expense recorded in the consolidated statements of operations (in thousands):

	Three Months Ended
	April 2,		April 3,
	2021		2020
Selling, general and administrative	$	4,929	$	2,798
Research and development and engineering		727		193
Cost of revenue		988		208
Total share-based compensation expense	$	6,644	$	3,199

Schedule of Share Based Payment Award Performance Stock Awards Valuation Assumptions

The fair value of the TSR-PSUs at the date of grant was estimated using the Monte Carlo valuation model with the following assumptions:

	Three Months Ended April 2, 2021
Grant-date stock price	$	138.23
Expected volatility		42.44	%
Risk-free interest rate		0.22	%
Expected annual dividend yield		—
Fair value	$	166.64

Amended and Restated 2010 Incentive Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Restricted Stock Units and Deferred Stock Units Issued and Outstanding

The table below summarizes activities relating to RSUs and DSUs issued and outstanding under the Company’s Amended and Restated 2010 Incentive Plan during the three months ended April 2, 2021:

	Shares (In thousands)			Weighted Average Grant Date Fair Value
Unvested at December 31, 2020		625		$	58.79
Granted		91		$	130.76
Vested		(283	)	$	75.06
Forfeited		(4	)	$	88.18
Unvested at April 2, 2021		429		$	63.05
Expected to vest as of April 2, 2021		405

Performance-Based Awards Issued and Outstanding

The table below summarizes the activities relating to the performance-based awards issued and outstanding under the Company’s Amended and Restated 2010 Incentive Plan during the three months ended April 2, 2021:

	Shares (In thousands)			Weighted Average Grant Date Fair Value
Unvested at December 31, 2020		142		$	88.99
Granted		67		$	150.89
Performance adjustment		28		$	67.72
Vested		(75	)	$	64.25
Forfeited		—		$	—
Unvested at April 2, 2021		162		$	122.26
Expected to vest as of April 2, 2021		136