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Equity Incentive Plans - Activity of Stock Options for the Period (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021
Options Outstanding
Beginning balance (in shares)	9,551,105
Options granted (in shares)	1,384,227
Options exercised (in shares)	(760,383)
Options cancelled and forfeited (in shares)	(276,880)
Ending balance (in shares)	9,898,069
Vested and exercisable (in shares)	2,600,982
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 5.55
Options granted (in usd per share)	50.57
Options exercised (in usd per share)	1.37
Options cancelled and forfeited (in usd per share)	17.08
Ending balance (in dollars per share)	11.84
Vested and exercisable (in usd per share)	$ 3.63

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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