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Stock-based Compensation - Stock Option Activity (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Options [Roll Forward]    
Balance as of December 31, 2021 (in shares) 1,170,890  
Granted (in shares) 13,000  
Cancelled/forfeited (in shares) (8,874)  
Balance as of September 30, 2022 (in shares) 1,175,016 1,170,890
Vested and expected to vest at September 30, 2022 (in shares) 1,126,448  
Exercisable at September 30, 2022 (in shares) 585,710  
Weighted Average Exercise Price [Roll Forward]    
Balance as of December 31, 2021 (in dollars per share) $ 5.01  
Granted (in dollars per share) 0.53  
Cancelled/forfeited (in dollars per share) 60.08  
Balance as of September 30, 2022 (in dollars per share) 4.54 $ 5.01
Vested and expected to vest at September 30, 2022 (in dollars per share) 4.59  
Exercisable at September 30, 2022 (in dollars per share) $ 6.69  
Weighted Average Remaining Contractual Life (years) [Roll Forward]    
Balance as of December 31, 2021 8 years 3 months 7 days 9 years
Vested and expected to vest at September 30, 2022 8 years 3 months  
Exercisable at September 30, 2022 8 years 7 days