Commitments and Contingencies - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Mar. 28, 2020 USD ($)	Sep. 26, 2020 USD ($)	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($) Renewals	Sep. 28, 2019 USD ($)
Other Commitments [Line Items]
Percentage of minimum royalty payment				0.13%
Percentage of maximum royalty payment				2.50%
Royalty expense		$ 0	$ 0	$ 11,000	$ 10,000
Operating lease expense		0		143,000
License Obligations		$ 10,000		$ 10,000
Operating lease obligations	$ 0
Texas [Member]
Other Commitments [Line Items]
Operating lease expiration date				Mar. 31, 2020
Renewal period of operating lease		5 years		5 years
Number of five-year renewal option | Renewals				1
Minimum [Member]
Other Commitments [Line Items]
Royalty obligations termination period				2020
Maximum [Member]
Other Commitments [Line Items]
Royalty obligations termination period				2025