Revenue - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022
Disaggregation of Revenue [Line Items]
Total net revenues	$ 35,761	$ 38,524
TFE
Disaggregation of Revenue [Line Items]
Total net revenues	35,761	38,524
TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	29,881	32,411
TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	5,880	6,113
HDD | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	35,154	34,331
HDD | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	29,507	28,300
HDD | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	5,647	6,031
DCP | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	44	17
DCP | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	1	3
DCP | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	43	14
PV | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	463	326
PV | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	273	258
PV | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	190	68
ASP | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	100	3,850
ASP | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	100	3,850
ASP | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	$ 0	$ 0