Revenue (Tables)

3 Months Ended

Apr. 03, 2021

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 the three months ended April 3, 2021 and March 28, 2020 along with the reportable segment for each category.

Major Products and Service Lines

TFE	Three Months Ended April 3, 2021										Three Months Ended March 28, 2020
	(In thousands)
	HDD		DCP		PV		ASP		Total		HDD		PV		Total
Systems, upgrades and spare parts	$	3,585	$	—	$	111	$	3,850	$	7,546	$	6,361	$	208	$	6,569
Field service		1,636		14		42		—		1,692		1,393		—		1,393
Total TFE net revenues	$	5,221	$	14	$	153	$	3,850	$	9,238	$	7,754	$	208	$	7,962

	Three Months Ended
Photonics	April 3, 2021		March 28, 2020
	(In thousands)
Products:
Military products	$	3,252	$	5,365
Commercial products		128		79
Repair and other services		442		430
Total Photonics product net revenues		3,822		5,874

	Three Months Ended
Photonics	April 3, 2021		March 28, 2020
	(In thousands)
Technology development:
Firm Fixed Price (“FFP”)		1,804		4,430
Cost Plus Fixed Fee (“CPFF”)		1,377		574
Time and materials		—		—
Total technology development net revenues		3,181		5,004
Total Photonics net revenues	$	7,003	$	10,878

Primary Geographical Markets

	Three Months Ended
	April 3, 2021						March 28, 2020
	(In thousands)
	TFE		Photonics		Total		TFE		Photonics		Total
United States	$	367	$	6,960	$	7,327	$	519	$	10,856	$	11,375
Asia		5,021		—		5,021		7,443		—		7,443
Europe		3,850		43		3,893		—		22		22
Total net revenues	$	9,238	$	7,003	$	16,241	$	7,962	$	10,878	$	18,840

Timing of Revenue Recognition

	Three Months Ended
	April 3, 2021						March 28, 2020
	(In thousands)
	TFE		Photonics		Total		TFE		Photonics		Total
Products transferred at a point in time	$	9,238	$	442	$	9,680	$	7,962	$	430	$	8,392
Products and services transferred over time		—		6,561		6,561		—		10,448		10,448
	$	9,238	$	7,003	$	16,241	$	7,962	$	10,878	$	18,840

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 the three months ended April 3 2021.

	April 3, 2021		January 2, 2021		Three Months Change
	(In thousands)
TFE:
Contract assets:
Accounts receivable, unbilled	$	—	$	369	$	(369	)
Contract liabilities:
Deferred revenue	$	276	$	482	$	(206	)
Customer advances		42		33		9
	$	318	$	515	$	(197	)
Photonics:
Contract assets:
Accounts receivable, unbilled	$	4,689	$	5,439	$	(750	)
Retainage		130		126		4
	$	4,819	$	5,565	$	(746	)
Contract liabilities:
Deferred revenue	$	1,126	$	779	$	347