Business Combination - Schedule of equity changes due to business combination (Details)	12 Months Ended
	Dec. 31, 2021 shares
Reverse Recapitalization [Abstract]
INSU Class A Common stock, outstanding prior to Business Combination (in shares)	23,540,000
INSU Class B Common stock, outstanding prior to Business Combination (in shares)	6,669,667
Less redemption of INSU shares (in shares)	8,372
Common stock of INSU (in shares)	30,201,295
Shares issued in PIPE (in shares)	17,000,000
Business Combination and PIPE financing shares (in shares)	47,201,295
Metromile Operating Company shares (in shares)	79,525,839
Total shares of common stock immediately after Business Combination (in shares)	126,727,134
Common and preferred stock outstanding (in shares)	78,313,665
Business combination converted exchange ratio	1.01547844