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Stock-Based Compensation - Summary of RSU Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares Issuable Under RSUs      
Options exercisable as of December 31, 2021 1,871,327    
Weighted Average Exercise Price      
Options exercisable as of December 31, 2021 $ 11.64    
RSU [Member]      
Shares Issuable Under RSUs      
Outstanding, beginning balance   3,056  
Granted 20,000    
RSUs Vested   (3,056)  
Outstanding, ending balance 20,000   3,056
RSUs vested and expected to vest as of December 31, 2021 20,000    
Weighted Average Exercise Price      
Outstanding, beginning balance   $ 66.96  
Granted $ 5.07    
RSUs Vested   $ 66.96  
Outstanding, ending balance 5.07   $ 66.96
RSUs vested and expected to vest as of December 31, 2021 $ 5.07    
Weighted Average Remaining Contractual Term (In years)      
Outstanding as of January 1, 2020 9 years 9 months 18 days   9 years 2 months 12 days
Granted 9 years 9 months 18 days    
RSUs Vested   9 years 2 months 12 days  
RSUs vested and expected to vest as of December 31, 2021 9 years 9 months 18 days