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Stockholders' Equity - Summary of Stock Option Activity (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Number of Options  
Outstanding at December 31, 2020 | shares 3,788
Granted | shares 1,766
Exercised | shares (31)
Forfeited | shares 0
Outstanding at March 31, 2021 | shares 5,523
Weighted-Average Exercise Price  
Outstanding at December 31, 2020 | $ / shares $ 9.06
Granted | $ / shares 23.33
Exercised | $ / shares 0.78
Forfeited | $ / shares 0
Outstanding at March 31, 2021 | $ / shares $ 13.67