Annual report pursuant to Section 13 and 15(d)

Borrowing Arrangements - Term Loan (Details)

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Borrowing Arrangements - Term Loan (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 29, 2018
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Interest expense   $ 17 $ 19
Term Loan [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount $ 5,000    
Interest rate     3.50%
Fee in the event of liquidity event   75  
Interest expense   $ 60 $ 162
Prime Rate [Member] | Term Loan [Member]      
Debt Instrument [Line Items]      
Spread on variable rate 0.25%