Common Stock, Capital Shares Reserved For Future Issuance, Threshold Percentage

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Common Stock, Percentage Of Total Shares Outstanding

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Share-based Compensation Arrangement by Share-based Payment Award, Eligibility For Vesting Period

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Share-based Compensation Arrangement by Share-based Payment Award, Exercise Price Cap, Percentage Of Fair Value

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Share-Based Compensation Arrangement By Share-Based Payment Award, Initial Offering Period

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Share-Based Compensation Arrangement By Share-Based Payment Award, Trading Days

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Discount rate from fair value on purchase date that participants pay for shares.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The highest quantity of shares an employee can purchase under the plan per period.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Employee Benefit Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 06, 2021	Feb. 29, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Sep. 09, 2021	Dec. 31, 2017	Nov. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent of match					100.00%		100.00%
Employer matching contribution, percent of employees' gross pay					4.00%		4.00%
Employer maximum annual contributions per employee, percent					4.00%		4.00%
Employer discretionary contribution amount			$ 300	$ 300	$ 900	$ 1,000	$ 1,200	$ 1,300
Employers matching contribution, vesting percentage					100.00%		100.00%
Common stock, par value, (in dollars per share)							$ 0.0001	$ 0.0001
Options granted (in shares)		3,669,608			1,937,968		14,386,426	8,828,538
Stock compensation expense			46,803	1,500	$ 132,542	$ 4,949
Unvested stock options, unrecognized stock-based compensation			463,700		$ 463,700		$ 14,900	$ 9,000
Cost not yet recognized, period for recognition					4 years 3 months 7 days		2 years 6 months
Stock options granted, grant date fair value (in dollars per share)		$ 1.18			$ 3.36	$ 2.10	$ 1.04	$ 0.62
Aggregate intrinsic value of stock options outstanding,			$ 160,100		$ 160,100		$ 445,300
Weighted average remaining contractual term of stock options outstanding					7 years 10 days		7 years 9 months
Stock options exercisable (in shares)			21,210,565		21,210,565		19,333,153
Aggregate intrinsic value of stock options exercisable			$ 109,000		$ 109,000		$ 246,200
Weighted average exercise price of stock options exercisable (in dollars per share)			$ 2.26		$ 2.26		$ 1.62
Weighted average remaining contractual term of stock options exercisable					6 years 4 months 2 days		6 years 10 months 6 days
Aggregate intrinsic value of stock options exercised					$ 36,400	$ 1,600	$ 5,800	$ 1,300
Cash received from stock options exercised							$ 2,100	$ 700
Shares remaining for future grants (in shares)							17,844,505	8,866,082
Warrants issued to purchase shares of common stock (in shares)										122,052	139,629
Exercise price of warrants (in dollars per share)									$ 0.10	$ 3.45	$ 2.61
Total fair value of warrants vested					$ 0	4,000	$ 7,000	$ 900
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value, (in dollars per share)			$ 0.0001		$ 0.0001		$ 0.0001
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, percentage of fair value of common stock							100.00%
Expiration period							10 years
Vesting period							5 years
Stock compensation expense			$ 1,665	1,500	$ 6,734	4,949	$ 7,100	$ 3,300
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense			17,396	0	$ 45,725	0
Stock options granted, grant date fair value (in dollars per share)					$ 14.77
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense			27,675	0	$ 80,016	0
Unvested stock options, unrecognized stock-based compensation			185,400		$ 185,400
Cost not yet recognized, period for recognition					4 years 3 months 7 days
Stock options granted, grant date fair value (in dollars per share)					$ 9.58
Eligibility for vesting period					90 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense			$ 67	$ 0	$ 67	0
Shares remaining for future grants (in shares)	2,785,582
Maximum number of shares that may be purchased by any one participant	5,000
Initial offering period	5 months
ESPP \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount rate	15.00%
Number of shares available for issuance			2,785,582		2,785,582
Calculation of maximum number of ESPP, percentage of total number of shares outstanding	1.00%
Maximum common stock reserved, threshold percentage	10.00%
2020 Equity And Management Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value, (in dollars per share)			$ 0.0001		$ 0.0001
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)					0
Cash received from stock options exercised					$ 5,500	$ 1,000
Shares remaining for future grants (in shares)							17,844,505
2014 Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, percentage of fair value of common stock					100.00%
Expiration period					10 years
2014 Plan \| Stock options \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
2014 Plan \| Stock options \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					5 years
2014 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
Trading days					90 days