Net Loss per Share - Antidilutive Potential Common Shares (Details)		12 Months Ended
	Jul. 28, 2022	Dec. 31, 2022 shares	Dec. 31, 2021 shares	Dec. 31, 2020 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common stock (in shares)		11,824,869	6,909,558	4,944,711
Metromile
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion ratio	0.05263
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common stock (in shares)		9,760,657	6,573,744	4,944,711
Unvested restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common stock (in shares)		1,651,243	335,814	0
Warrants for common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common stock (in shares)		412,969	0	0