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Income Taxes - Effective Tax Rate Differs from the Statutory Federal Income Tax Rate (Details)
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Company's effective tax rate differs from the statutory federal income tax rate    
Income tax provision at statutory rate 21.00% 21.00%
State income taxes, net of federal benefit 0.90% 2.80%
Permanent differences (2.80%) (3.40%)
Research and development credits 0.40% 0.40%
Change in valuation allowance (23.30%) (21.30%)
Foreign rate differential 0.40% (0.30%)
Other 3.00% 0.30%
Effective tax rate (0.40%) (0.50%)