Net Loss Per Share - Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares	3 Months Ended	4 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Earnings Per Share Diluted [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	21,320,100	66,098,810	21,320,100
Convertible Preferred Stock [Member]
Earnings Per Share Diluted [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	56,187,500	0
Stock Options to Purchase Common Stock [Member]
Earnings Per Share Diluted [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	17,460,961	2,968,070	17,460,961
Unvested Restricted Common Stock [Member]
Earnings Per Share Diluted [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	3,859,139	6,943,240	3,859,139