Redeemable Convertible Preferred Stock - Schedule of Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Temporary Equity [Line Items]
Temporary Equity, Shares Authorized	10,000,000	12,909,389
Temporary Equity, Shares Issued	0	7,140,157
Temporary Equity, Shares Outstanding	0	7,140,157
Temporary Equity, Carrying Value	$ 0	$ 46,551
Temporary Equity, Liquidation Preference	$ 0	$ 49,891
Series A Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary Equity, Issue Price		$ 6.00
Temporary Equity, Shares Authorized		2,717,084
Temporary Equity, Shares Issued		2,717,082
Temporary Equity, Shares Outstanding		2,717,082
Temporary Equity, Carrying Value		$ 17,074
Temporary Equity, Liquidation Preference		$ 18,569
Series A Athenen Acquisition Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary Equity, Issue Price		$ 5.80
Temporary Equity, Shares Authorized		2,500,000
Temporary Equity, Shares Issued		2,500,000
Temporary Equity, Shares Outstanding		2,500,000
Temporary Equity, Carrying Value		$ 14,500
Temporary Equity, Liquidation Preference		$ 15,253
Series A1 Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary Equity, Issue Price		$ 7.80
Temporary Equity, Shares Authorized		7,692,305
Temporary Equity, Shares Issued		1,923,075
Temporary Equity, Shares Outstanding		1,923,075
Temporary Equity, Carrying Value		$ 14,977
Temporary Equity, Liquidation Preference		$ 16,069