Related Party Transactions - Schedule of Capital Contributions from Parent (Details) - Majority shareholder - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Related Party Transaction [Line Items]
Capital contributions from Amprius Holdings	$ 131	$ 14,734	$ 882	$ 19,808
Stock-based compensation
Related Party Transaction [Line Items]
Capital contributions from Amprius Holdings	131	37	377	116
Other allocated corporate costs
Related Party Transaction [Line Items]
Capital contributions from Amprius Holdings	0	85	295	246
Cash
Related Party Transaction [Line Items]
Capital contributions from Amprius Holdings	$ 0	$ 14,612	$ 210	$ 19,446