Stockholders' Equity - Summary of Stock Option Activity (Details) shares in Thousands	9 Months Ended
Sep. 30, 2021 $ / shares shares
Number of Options
Outstanding at December 31, 2020 \| shares	3,788
Granted \| shares	2,455
Exercised \| shares	(114)
Forfeited/expired \| shares	(480)
Outstanding at September 30, 2021 \| shares	5,649
Weighted-Average Exercise Price
Outstanding at December 31, 2020 \| $ / shares	$ 9.06
Granted \| $ / shares	23.26
Exercised \| $ / shares	1.37
Forfeited/expired \| $ / shares	23.02
Outstanding at September 30, 2021 \| $ / shares	$ 14.20

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
-Name Accounting Standards Codification
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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