Revenue (Tables)

12 Months Ended

Dec. 28, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue from Contracts with Customers

The following tables represent a disaggregation of revenue from contracts with customers for fiscal 2019 and 2018 along with the reportable segment for each category.

Major Products and Service Lines

TFE	2019								2018
	(in thousands)
	HDD		DCP		PV		Total		HDD		DCP		PV		Total
Systems, upgrades and spare parts	$	52,759	$	—	$	15,653	$	68,412	$	55,793	$	1	$	5,253	$	61,047
Field service		5,210		2		54		5,266		8,255		—		46		8,301
Total TFE net revenues	$	57,969	$	2	$	15,707	$	73,678	$	64,048	$	1	$	5,299	$	69,348

Photonics	2019		2018
	(in thousands)
Products:
Military products	$	12,480	$	13,828
Commercial products		640		335
Repair and other services		2,430		1,809
Total Photonics product net revenues		15,550		15,972
Technology development:
FFP		12,521		2,463
CPFF		7,134		7,258
Time and materials		2		73
Total technology development net revenues		19,657		9,794
Total Photonics net revenues	$	35,207	$	25,766

Primary Geography Markets

	2019						2018
	(in thousands)
	TFE		Photonics		Total		TFE		Photonics		Total
United States	$	1,306	$	34,664	$	35,970	$	4,050	$	23,862	$	27,912
Asia		72,372		—		72,372		65,298		31		65,329
Europe		—		543		543		—		1,648		1,648
Rest of World		—		—		—		—		225		225
Total net revenues	$	73,678	$	35,207	$	108,885	$	69,348	$	25,766	$	95,114

Timing of Revenue Recognition

	2019						2018
	(in thousands)
	TFE		Photonics		Total		TFE		Photonics		Total
Products transferred at a point in time	$	73,678	$	2,430	$	76,108	$	69,348	$	1,809	$	71,157
Products and services transferred over time		—		32,777		32,777		—		23,957		23,957
Total net revenues	$	73,678	$	35,207	$	108,885	$	69,348	$	25,766	$	95,114

Changes in Contract Assets and Contract Liabilities

The following table reflects the changes in our contract assets, which we classify as accounts receivable, unbilled or retainage and our contract liabilities which we classify as deferred revenue and customer advances for fiscal 2019:

	December 28, 2019		December 29, 2018		Change
	(In thousands)
TFE:
Contract assets:
Accounts receivable, unbilled	$	760	$	514	$	246
Contract liabilities:
Deferred revenue	$	320	$	633	$	(313	)
Customer advances		4,007		14,314		(10,307	)
	$	4,327	$	14,947	$	(10,620	)
Photonics:
Contract assets:
Accounts receivable, unbilled	$	3,210	$	1,493	$	1,717
Retainage		99		157		(58	)
	$	3,309	$	1,650	$	1,659
Contract liabilities:
Deferred revenue	$	—	$	1,101	$	(1,101	)