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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised	$ 0.1	$ 8.1
Unrecognized compensation costs	$ 7.5
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options granted	10 years
Vesting period	4 years
Percentage of awards vesting each year	25.00%
Shares allocated for issuance (in shares)	6,000,000
Shares available for future issuance (in shares)	700,000
Stock-based compensation costs	$ 1.5	$ 1.0
Weighted-average expected recognition period	2 years 7 months 28 days
Expected dividend rate	0.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average expected recognition period	3 years 25 days
Awards granted (in shares)	200,000	0
Awards vested and released from right to repurchase (in shares)	26,336	25,000
Awards cancelled (in shares)	0	0
Weighted average estimated fair value of awards granted (in shares)	$ 18.70
Unrecognized stock-based compensation	$ 4.3

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

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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