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Warrants to Acquire Shares of Common Stock - Changes in Fair Value of Warrant Liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2020
Dec. 31, 2021
Dec. 31, 2020
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance   $ 55 $ 52
Fair value of warrants exercised $ (100)   (94)
Change in fair value of warrants   (15) 97
Warrant liability, Ending balance   $ 40 $ 55