Business Combination - Schedule of Number of Shares of Common Stock Issued Immediately Following Consummation of Business Combination (Parenthetical) (Details) - shares	Dec. 31, 2021	Dec. 31, 2020	Nov. 25, 2020	Nov. 24, 2020
Business Combination [Line Items]
Common stock, outstanding			22,984,745	23,000,000
Class A Common Stock
Business Combination [Line Items]
Common stock, outstanding	332,869,000	207,769,000
Class B Common Stock
Business Combination [Line Items]
Common stock, outstanding	95,450,000	156,225,000
Legacy Quantum Scape | Class A Common Stock
Business Combination [Line Items]
Common stock, outstanding				27,533,913
Legacy Quantum Scape | Class B Common Stock
Business Combination [Line Items]
Common stock, outstanding				39,361,342