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Government Assistance - PPP Loan (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 20, 2020
Sep. 30, 2020
Sep. 30, 2020
Sep. 29, 2021
Debt Instrument [Line Items]        
Grants recognized as a reduction to operating expenses   $ 176,000 $ 1,816,000  
Paycheck Protection Program, CARES Act [Member]        
Debt Instrument [Line Items]        
Face amount of loan $ 1,806,000      
Stated interest rate (as percentage) 1.00%      
Term of loan 2 years      
Grants recognized as a reduction to operating expenses   166,000 1,806,000  
Amount of loan forgiveness under Paycheck Protection Program       $ 1,806,000
Interest expense   $ 0 $ 0