Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Thousands			3 Months Ended
	Feb. 08, 2022 USD ($) shares	Jan. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Jan. 01, 2022 USD ($)
Accounting Policies [Line Items]
Cash acquired from business acquisition and PIPE financing			$ 43,800
Payment for settlement of debt outstanding			106,000
Proceeds from share subscription facility provided by business acquired			$ 125,000
Percentage of employees negotiated payment terms			50.00%
Lessee, Operating Lease, Term of Contract			12 months
Operating Lease, Right-of-Use Asset			$ 300	$ 500
Operating Lease, Liability			291	$ 500
Pay Check Protection Program Loan [Member]
Accounting Policies [Line Items]
Proceeds from Loans			$ 2,500
Merger Agreement [Member] | Quanergy Common Stock [Member]
Accounting Policies [Line Items]
Common stock convertible, conversion ratio	3.8799
Merger Agreement [Member] | Quanergy Common Stock [Member] | Minimum [Member]
Accounting Policies [Line Items]
Class of warrant or right conversion ratio	1.0
Merger Agreement [Member] | Quanergy Common Stock [Member] | Maximum [Member]
Accounting Policies [Line Items]
Class of warrant or right conversion ratio	1.0
Common Class A [Member] | Merger Agreement [Member] | Quanergy Systems, Inc [Member]
Accounting Policies [Line Items]
Number Shareholders of the Company | shares	600,000	26,867,796
Percentage of the shares with redemption rights	2.2	97.3
Right exercised to redeem shares for cash at redemption price per share | $ / shares		$ 10.07
Number of Redemption Right Shares Reversed	$ 6,000
Right exercised to redeem shares for cash at redemption		$ 270,500
Series B Preferred Stock [Member] | Merger Agreement [Member]
Accounting Policies [Line Items]
Preferred Stock, Convertible, Conversion Ratio	11.5423
Series C Preferred Stock [Member] | Merger Agreement [Member]
Accounting Policies [Line Items]
Preferred Stock, Convertible, Conversion Ratio	14.3118
PIPE Shares [Member] | Subscription Agreement [Member]
Accounting Policies [Line Items]
Number of shares subscribed to purchase | shares			3,695,000
Per share price of subscribed shares | $ / shares			$ 10.00
Value of subscribed shares			$ 37,000