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Balance Sheet Components (Tables)

12 Months Ended

Dec. 26, 2020

Balance Sheet Components [Abstract]

Schedule of Marketable Securities

Marketable securities consisted of the following (in thousands):

December 26, 2020			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
U.S. Treasuries			$	40,602					$	124					$	—					$	40,726
Corporate bonds			24,156						176						(2)						24,330
Certificate of deposit			2,160						19						—						2,179
Agency securities			575						—						—						575
			$	67,493					$	319					$	(2)					$	67,810

December 28, 2019			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
U.S. Treasuries			$	10,458					$	11					$	—					$	10,469
Commercial paper			3,914						1						(4)						3,911
Corporate bond			33,867						68						(7)						33,928
Certificate of deposit			3,584						5						—						3,589
Agency securities			24,408						38						(16)						24,430
			$	76,231					$	123					$	(27)					$	76,327

Contractual Maturity of Marketable Securities

The contractual maturities of marketable securities were as follows (in thousands):

			December 26, 2020												December 28, 2019
			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Due in one year or less			$	50,500					$	50,679					$	38,899					$	38,944
Due after one year to five years			16,993						17,131						37,332						37,383
			$	67,493					$	67,810					$	76,231					$	76,327

Schedule of Net Inventory

Inventories consisted of the following (in thousands):

			December 26, 2020						December 28, 2019
Raw materials			$	48,122					$	38,528
Work-in-progress			30,806						29,720
Finished goods			20,301						15,010
			$	99,229					$	83,258

Schedule of Property, Plant and Equipment

Property, plant and equipment, net consisted of the following (in thousands):

			December 26, 2020						December 28, 2019
Land			$	4,751					$	—
Machinery and equipment			226,185						201,861
Computer equipment and software			36,361						35,192
Furniture and fixtures			6,894						6,756
Leasehold improvements			79,144						76,081
Sub-total			353,335						319,890
Less: Accumulated depreciation and amortization			(294,468)						(273,001)
Net property, plant and equipment			58,867						46,889
Construction-in-progress			45,236						11,858
Total			$	104,103					$	58,747

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

			December 26, 2020						December 28, 2019
Accrued compensation and benefits			$	33,110					$	21,329
Accrued employee stock purchase plan contributions withheld			4,240						3,331
Accrued warranty			3,918						1,942
Accrued income and other taxes			6,976						6,846
Accrued contingent consideration			4,012						—
Other accrued expenses			3,086						2,991
			$	55,342					$	36,439

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