Revenue - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total net revenues	$ 28,505	$ 17,915	$ 52,662	$ 39,758
Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues		16,039		35,946
Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		1,432		3,368
Cancellation fee
Disaggregation of Revenue [Line Items]
Total net revenues		444		444
HDD
Disaggregation of Revenue [Line Items]
Total net revenues	28,505	17,812	52,662	39,616
HDD | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	11,833	16,033	33,004	35,901
HDD | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	1,318	1,335	4,304	3,271
HDD | Cancellation fee
Disaggregation of Revenue [Line Items]
Total net revenues	$ 15,354	444	$ 15,354	444
PV
Disaggregation of Revenue [Line Items]
Total net revenues				28
PV | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues				28
PV | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues				0
PV | Cancellation fee
Disaggregation of Revenue [Line Items]
Total net revenues				0
ASP
Disaggregation of Revenue [Line Items]
Total net revenues		103		114
ASP | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues		6		17
ASP | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		97		97
ASP | Cancellation fee
Disaggregation of Revenue [Line Items]
Total net revenues		$ 0		$ 0