XML 50 R34.htm IDEA: XBRL DOCUMENT

Employee Benefit Plans and Stock-based Compensation (Tables)

9 Months Ended

Sep. 27, 2019

Share-based Payment Arrangement [Abstract]

The following table summarizes the Company’s stock option activities and related information during the nine months ended September 27, 2019 (in thousands, except per share amounts and terms):



	Stock Options Outstanding
	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance at December 31, 2018	3,068		$	5.76
Exercised	(308	)	4.85
Canceled or expired	(379	)	6.14
Balance at September 27, 2019	2,381		5.81		2.0	$	2,719.0
As of September 27, 2019
Vested and expected to vest	2,381		5.81		2.0	$	2,719.0
Exercisable	2,380		5.82		2.0	$	2,715.6

Summary of Restricted Stock Units Outstanding

The following table summarizes the Company’s RSUs activities and related information during the nine months ended September 27, 2019 (in thousands, except per share amounts):



	Restricted Stock Units Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Balance at December 31, 2018	3,403		$	3.99
Granted	2,671		5.75
Vested	(2,126	)	3.96
Forfeited	(72	)	4.90
Balance at September 27, 2019	3,876		5.10

Schedule of Defined Benefit Plans Obligations

The table below presents the components of net periodic benefit costs (in thousands):



	Three months ended				Nine months ended
	September 27, 2019		September 28, 2018		September 27, 2019		September 28, 2018
Service cost	$	57	$	59	$	171	$	185
Interest cost	20		18		59		56
Net periodic benefit cost	$	77	$	77	$	230	$	241

Summary of Stock-Based Compensation Expense

Stock-based Compensation

The following table summarizes stock-based compensation for all plans (in thousands):



	Three months ended				Nine months ended
	September 27, 2019		September 28, 2018		September 27, 2019		September 28, 2018
Stock-based compensation in:
Cost of revenue	$	410	$	614	$	830	$	1,577
Research and development expense	1,120		1,676		2,318		4,298
Selling, general and administrative expense	2,566		3,143		5,571		8,327
Total stock-based compensation in operating expense	3,686		4,819		7,889		12,625
Total stock-based compensation	$	4,096	$	5,433	$	8,719	$	14,202

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions



	ESPP Purchase Period Ending
	December 31, 2019		July 1, 2019		December 31, 2018		July 2, 2018
Expected term (years)	0.5		0.5		0.5		0.5
Volatility	33	%	43	%	51	%	60	%
Risk-free interest rate	2.1	%	2.5	%	2.1	%	1.7	%
Expected dividends	0.0	%	0.0	%	0.0	%	0.0	%
Estimated weighted average fair value per share at purchase date	$1.36		$1.31		$1.32		$1.34