Condensed Consolidated Statements of Stockholder's Equity / (Deficit) - USD ($) $ in Thousands	Total	Previously Reported [Member]	Revision of Prior Period, Adjustment [Member]	Preferred Stock [Member] Convertible Preferred Stock [Member] Previously Reported [Member]	Preferred Stock [Member] Convertible Preferred Stock [Member] Revision of Prior Period, Adjustment [Member]	Common Stock [Member]	Common Stock [Member] Previously Reported [Member]	Common Stock [Member] Revision of Prior Period, Adjustment [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Previously Reported [Member]	Additional Paid-in Capital [Member] Revision of Prior Period, Adjustment [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Previously Reported [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] Previously Reported [Member]
Beginning balance at Dec. 31, 2020	$ (35,826)	$ (188,804)	$ 152,978	$ 152,978	$ (152,978)				$ 208,288	$ 55,310	$ 152,978	$ (244,053)	$ (244,053)	$ (61)	$ (61)
Beginning balance, shares at Dec. 31, 2020				7,695,112	(7,695,112)	2,788,351	234,785	2,553,566
Issuance of Restricted Stock Awards ("RSAs")	563								563
Issuance of Restricted Stock Awards ("RSAs"), shares						58,199
Stock-based compensation	1,017								1,017
Shares issued upon exercise of options	74								74
Shares issued upon exercise of options, shares						3,878
Shares issued upon exercise of common stock warrants	21,971								21,971
Other comprehensive gain (loss)	5													5
Net loss	(14,714)											(14,714)
Ending balance at Mar. 31, 2021	(26,910)								231,913			(258,767)		(56)
Ending balance, shares at Mar. 31, 2021						2,850,428
Beginning balance at Dec. 31, 2020	(35,826)	(188,804)	152,978	$ 152,978	$ (152,978)				208,288	55,310	152,978	(244,053)	(244,053)	(61)	(61)
Beginning balance, shares at Dec. 31, 2020				7,695,112	(7,695,112)	2,788,351	234,785	2,553,566
Net loss	(54,180)
Ending balance at Sep. 30, 2021	(57,319)								240,987			(298,233)		(73)
Ending balance, shares at Sep. 30, 2021						2,850,876
Beginning balance at Mar. 31, 2021	(26,910)								231,913			(258,767)		(56)
Beginning balance, shares at Mar. 31, 2021						2,850,428
Stock-based compensation	1,065								1,065
Other comprehensive gain (loss)	(11)													(11)
Vesting of RSAs	4,659								4,659
Net loss	(20,467)											(20,467)
Ending balance at Jun. 30, 2021	(41,664)								237,637			(279,234)		(67)
Ending balance, shares at Jun. 30, 2021						2,850,428
Stock-based compensation	994								994
Shares issued upon exercise of common stock warrants, shares						448
Other comprehensive gain (loss)	(6)													(6)
Vesting of RSAs	2,356								2,356
Net loss	(18,999)											(18,999)
Ending balance at Sep. 30, 2021	(57,319)								240,987			(298,233)		(73)
Ending balance, shares at Sep. 30, 2021						2,850,876
Beginning balance at Dec. 31, 2021	(65,353)	(218,331)	152,978	$ 152,978	$ (152,978)				242,305	89,327	152,978	(307,597)	(307,597)	(61)	(61)
Beginning balance, shares at Dec. 31, 2021				7,695,112	(7,695,112)	2,850,876	250,898	2,599,978
Conversion of 2023 Notes into common stock	101,978								101,978
Conversion of 2023 Notes into common stock, Shares						723,223
Issuance of common stock upon the reverse capitalization, net of offering costs	(9,150)								(9,150)
Issuance of common stock upon the reverse capitalization, net of offering costs, Shares						411,610
Offering cost in connection with Business Combination and PIPE financing	(12,450)								(12,450)
Cash - PIPE	36,950								36,950
Stock Issued During Period, PIPE Shares, New Issues						184,750
Subsequent issuance of shares for offering costs incurred in connection with Business Combination and PIPE financing	9,531								9,531
Subsequent issuance of shares for offering costs incurred in connection with Business Combination and PIPE financing, shares						240,182
Issuance of common stock upon vesting of RSUs, shares						358,776
Issuance of common stock warrants	17,602								17,602
Stock-based compensation	51,561								51,561
Shares issued upon exercise of options	58								58
Shares issued upon exercise of options, shares						9,892
Shares issued upon exercise of common stock warrants	29								29
Shares issued upon exercise of common stock warrants, shares						145,379
Other comprehensive gain (loss)	(11)													(11)
Net loss	(104,682)											(104,682)
Ending balance at Mar. 31, 2022	26,063								438,414			(412,279)		(72)
Ending balance, shares at Mar. 31, 2022						4,924,688
Beginning balance at Dec. 31, 2021	(65,353)	$ (218,331)	$ 152,978	$ 152,978	$ (152,978)				242,305	$ 89,327	$ 152,978	(307,597)	$ (307,597)	(61)	$ (61)
Beginning balance, shares at Dec. 31, 2021				7,695,112	(7,695,112)	2,850,876	250,898	2,599,978
Cash - PIPE	$ 36,950
Shares issued upon exercise of options, shares	14,741
Net loss	$ (148,008)
Ending balance at Sep. 30, 2022	11,477					$ 1			467,185			(455,605)		(104)
Ending balance, shares at Sep. 30, 2022						7,077,402
Beginning balance at Mar. 31, 2022	26,063								438,414			(412,279)		(72)
Beginning balance, shares at Mar. 31, 2022						4,924,688
Issuance of common stock upon vesting of RSUs, shares						34,961
Stock-based compensation	5,006								5,006
Shares issued upon exercise of common stock warrants	41								41
Shares issued upon exercise of common stock warrants, shares						206,610
Other comprehensive gain (loss)	(7)													(7)
Shares issued upon draw down of GEM agreement, shares						1,314,159
Shares issued upon draw down of GEM agreement	19,379					$ 1			19,378
Net loss	(25,674)											(25,674)
Ending balance at Jun. 30, 2022	24,808					$ 1			462,839			(437,953)		(79)
Ending balance, shares at Jun. 30, 2022						6,480,418
Issuance of common stock upon vesting of RSUs, shares						43,369
Stock-based compensation	4,708								4,708
Shares issued upon exercise of options	15								15
Shares issued upon exercise of options, shares						4,849
Shares issued to GEM in exchange for funding Shares						600,000
Shares returned to Quanergy on settlement of GEM funding Amount	(377)								377
Shares returned to Quanergy on settlement of GEM funding Shares						56,729
Shares issued upon exercise of common stock warrants, shares						5,495
Other comprehensive gain (loss)	(25)													(25)
Net loss	(17,652)											(17,652)
Ending balance at Sep. 30, 2022	$ 11,477					$ 1			$ 467,185			$ (455,605)		$ (104)
Ending balance, shares at Sep. 30, 2022						7,077,402