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Stock-Based Compensation - Narrative (Details) - Outstanding options to purchase common stock
shares in Millions, $ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award  
Unvested options outstanding (shares) | shares 2.6
Period for recognition 2 years 3 months 18 days
Unrecognized compensation expense | $ $ 20.2