Redeemable Convertible Preferred Stock - Narrative (Details) $ in Thousands	1 Months Ended			2 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($) customer shares	Jun. 30, 2021 USD ($) shares	Jul. 31, 2020 USD ($)	Aug. 31, 2020 USD ($) shares	Sep. 30, 2021 USD ($) customer shares	Sep. 30, 2021 USD ($) $ / shares customer shares	Dec. 31, 2020 USD ($) shares
Temporary Equity [Line Items]
Convertible preferred stock, shares, number of shares issued upon conversion (in shares) | shares	29,912,264				29,912,264	29,912,264
Redeemable convertible preferred stock, shares issued (in shares) | shares	0				0	0	25,402,402
Stock issuance costs	$ 2,900	$ 290		$ 496	$ 16,076
8% Dividend Per Share | $ / shares						0.08
Dividends declared and payable	$ 0				$ 0	$ 0	$ 0
Common stock voting rights, number of votes (per share) | customer	1				1	1
Common Stock
Temporary Equity [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering			$ 1,500
Series G
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares issued (in shares) | shares		4,447,530
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		$ 85,000
Stock issuance costs		$ 300
8% Dividend Per Share | $ / shares						1,528.9000
Series F
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares issued (in shares) | shares				5,226,969
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs				$ 77,000
Stock issuance costs				$ 500
8% Dividend Per Share | $ / shares						1,178.2000