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Stock-Based Compensation - Summary of RSU Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Granted (in dollars per share) $ 1.53 $ 54.00
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Beginning balance (in shares) 0  
Granted (in shares) 170  
Vested (in shares) 0  
Ending balance (in shares) 170 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Beginning balance (in dollars per share) $ 0  
Granted (in dollars per share) 1.89  
Vested (in dollars per share) 0  
Ending balance (in dollars per share) $ 1.89 $ 0