Overview (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Aug. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Net loss	$ 229,506	$ 229,813
Net cash used in operating activities	145,018	196,857
Accumulated deficit	875,846	646,340
Cash and cash equivalents	69,473	$ 17,076
Working capital	61,461
Outstanding debt	$ 3,332
DOE Clean Energy Financing Program | Notes Payable
Line of Credit Facility [Line Items]
Aggregate principal amount			$ 398,600