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Stock-Based Compensation - 2020 Employee Stock Purchase Plan (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 period shares
Stock-Based Compensation
Percent of common stock at fair market value to be exercised			100.00%
Stock-based compensation expense	$ 4,157	$ 582	$ 11,286	$ 736
Employee stock purchase plan contingently issuable
Stock-Based Compensation
Percentage of eligible earnings withheld					15.00%
Percent of common stock at fair market value to be exercised					85.00%
Number of months for each purchase period					6 months
Number of purchase periods | period					2
Common stock reserved for issuance | shares					430,416
Stock-based compensation expense			$ 100
Employee stock purchase plan contingently issuable | Maximum
Stock-Based Compensation
Offering period					27 months
Stock-based compensation expense	$ 100

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Aggregate number of common shares reserved for future issuance.

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