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Equity Incentive Plans - Restricted Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Weighted Average Grant Date Fair Value
Beginning balance (in usd per share)	$ 7.91
Granted (in usd per share)	53.81
Vested (in usd per share)	46.49
Ending balance (in usd per share)	$ 25.34
Restricted Stock
Number of Shares
Beginning balance (in shares) | shares	775,641
Granted (in shares) | shares	10,728
Repurchased (in shares) | shares	(19,728)
Vested (in shares) | shares	(461,077)
Ending balance (in shares) | shares	305,564
Weighted Average Grant Date Fair Value
Beginning balance (in usd per share)	$ 1.77
Granted (in usd per share)	1.66
Repurchased (in usd per share)	1.14
Vested (in usd per share)	1.78
Ending balance (in usd per share)	$ 1.79

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Repurchased

+ References

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Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Repurchased, Weighted Average Exercise Price

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
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-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Name Accounting Standards Codification
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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