Redeemable Convertible Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended					12 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares	Aug. 31, 2020 USD ($) $ / shares shares	Apr. 30, 2020 USD ($) $ / shares shares	Jan. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares	Aug. 17, 2020	Dec. 31, 2019	Jul. 31, 2017 shares
Class of Stock [Line Items]
Redeemable convertible preferred stock shares authorized							10,000,000	10,000,000
Repayments of convertible notes and accrued interest | $					$ 4.7
Preferred to Common exchange ratio							0.34
Redeemable convertible preferred stock par or stated value per share | $ / shares							$ 0.001	$ 0.001
Series A Redeemable Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Redeemable convertible preferred stock allocated to investors					55,000,000
Redeemable convertible preferred stock shares authorized											55,700,000
Redeemable convertible preferred stock issued during period shares new issues				11,000,000	18,700,000	26,000,000
Redeemable convertible preferred stock issue price per share | $ / shares				$ 1.00	$ 1.00	$ 1.00
Proceeds from issuance of redeemable convertible preferred stock | $				$ 11.0	$ 14.0	$ 26.0
Preferred to Common exchange ratio										1.00
Redeemable convertible preferred stock issuance costs | $				$ 0.1
Series B Redeemable Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Redeemable convertible preferred stock shares authorized			45,372,051
Redeemable convertible preferred stock issued during period shares new issues	22,686,025		22,686,025
Proceeds from issuance of redeemable convertible preferred stock | $	$ 30.0		$ 29.8
Redeemable convertible preferred stock issuance costs | $	$ 0.1		$ 0.2
Redeemable convertible preferred stock issue price per share | $ / shares	$ 1.32		$ 1.32
Series B-1 Redeemable Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Redeemable convertible preferred stock shares authorized		27,152,255
Redeemable convertible preferred stock issued during period shares new issues		27,152,255
Proceeds from issuance of redeemable convertible preferred stock | $		$ 51.1
Preferred to Common exchange ratio									1.00
Redeemable convertible preferred stock issuance costs | $		$ 0.1
Redeemable convertible preferred stock issue price per share | $ / shares		$ 1.89