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Employee Benefit Plans and Stock-based Compensation (Tables)

6 Months Ended

Jun. 28, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

The following table summarizes the Company’s stock option activities and related information during the six months ended June 28, 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	(39	)	3.75
Canceled or expired	(379	)	6.14
Balance at June 28, 2019	2,650		5.73		2.2	$	1,690.3
As of June 28, 2019
Vested and expected to vest	2,650		5.73		2.2	$	1,690.3
Exercisable	2,645		5.74		2.2	$	1,684.4

Summary of Restricted Stock Units Outstanding

The following table summarizes the Company’s RSUs activities and related information during the six months ended June 28, 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	2,501		5.67
Vested	(1,600	)	3.97
Forfeited	(45	)	4.72
Balance at June 28, 2019	4,259		4.99

Schedule of Defined Benefit Plans Obligations

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



	Three months ended				Six months ended
	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
Service cost	$	57	$	63	$	114	$	126
Interest cost	19		19		39		38
Net periodic benefit cost	$	76	$	82	$	153	$	164

Summary of Stock-Based Compensation Expense

Stock-based Compensation

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



	Three months ended				Six months ended
	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
Stock-based compensation in:
Cost of revenue	$	195	$	448	$	420	$	963
Research and development expense	582		818		1,198		2,622
Selling, general and administrative expense	1,733		1,746		3,005		5,184
Total stock-based compensation in operating expense	2,315		2,564		4,203		7,806
Total stock-based compensation	$	2,510	$	3,012	$	4,623	$	8,769

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



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