Commitments and Contingencies - Additional Information (Details) $ in Millions	Sep. 02, 2021 USD ($)
Stock Purchase Agreement with Covea Cooperations
Cash consideration payable in a stock purchase transaction	$ 48.6

The amount of cash consideration payable in a stock purchase transaction.

No definition available.

Name:	prch_StockPurchaseTransactionCashConsiderationPayable
Namespace Prefix:	prch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant