Income Taxes - Additional Information (Detail) - USD ($)		12 Months Ended
	Jun. 29, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 27, 2020	Dec. 31, 2018
Income Tax Contingency [Line Items]
Deferred provision for income taxes		$ 0	$ 0
Increase in valuation allowance		$ 29,700,000
Deferred tax assets net operating loss carryforwards ownership change in percentage		50.00%
Offset percentage of taxable income		80.00%
Unrecognized tax benefits, income tax penalties and interest expense		$ 0	0
Unrecognized tax benefits		1,536,000	$ 637,000		$ 79,000
Effective income tax rate reconciliation, deduction, other		$ 0
Uncertain tax positions changes in period		12 months
Income tax examination, description		The Company is not currently under examination by income tax authorities in federal, state or other jurisdictions. All tax returns will remain open for examination by the federal and state authorities for three and four years, respectively, from the date of utilization of any NOLs or credits.
Impact of CARES Act to Income Taxes		$ 0
Suspension period	3 years
Cap period	3 years
Incentive tax credits offset amount of tax	$ 5,000,000
Taxable income	$ 1,000,000
CAA impact to tax provision				$ 0
Research and Development Credit [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits		1,500,000
Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 148,700,000
Deferred tax assets net operating loss carryforwards expiration year		2038
Deferred tax assets, research and development tax credit carryforwards		$ 4,100,000
Tax credit research and development carryforward expiration year		2038
Income tax examination, tax returns open for examination, period		3 years
State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 152,800,000
Deferred tax assets, research and development tax credit carryforwards		$ 2,100,000
Income tax examination, tax returns open for examination, period		4 years