Nature of Business and Basis of Presentation (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	May 31, 2023	Feb. 28, 2023	Dec. 31, 2022
Business Combination, Separately Recognized Transactions [Line Items]
Net loss	$ (30,258)	$ (8,818)
Accumulated deficit	(88,846)				$ (58,598)
Cash flows used in operating activities	(46,013)	$ (30,096)
Unrestricted cash and cash equivalents	101,623				60,554
Short-term investments	107,392				$ 194,775
Restricted cash	$ 4,500
Hyliion Inc. | Maximum | Collaborative Arrangement
Business Combination, Separately Recognized Transactions [Line Items]
Term of technology development agreement				1 year
Reimbursable research and development expenses				$ 1,000
Subsequent Event
Business Combination, Separately Recognized Transactions [Line Items]
Unrestricted cash, cash equivalents and short-term investments			$ 185,000