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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options outstanding, beginning balance (in shares) 208  
Granted (in shares) 312  
Options outstanding, ending balance (in shares) 520 208
Options exercisable (in shares) 90  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted average exercise price, beginning balance (in dollars per share) $ 13.38  
Weighted average exercise price, granted (in dollars per share) 7.99  
Weighted average exercise price, ending balance (in dollars per share) 10.14 $ 13.38
Weighted average exercise price, exercisable (in dollars per share) $ 23.36  
Weighted average remaining contractual term, outstanding (in years) 9 years 3 months 9 years 29 days
Weighted average remaining contractual term, options exercisable (in years) 8 years 5 months 23 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Roll Forward]    
Aggregate intrinsic value, beginning balance $ 733  
Aggregate intrinsic value, ending balance 2,688 $ 733
Aggregate intrinsic value, options exercisable $ 695