Bankruptcy Proceedings, Condensed Combined Debtors' Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net loss	$ (366,302)	$ (273,140)	$ (571,269)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	16,969	25,255	26,624
Amortization of operating lease right-of-use assets	6,113	8,497	6,987
Amortization of discount on marketable securities	(1,099)	(2,248)	(5,929)
Loss on marketable securities	690	1,901	7,594
Vendor stock in lieu of cash program	12,785	14,614	50,829
Amortization of debt discount and issuance costs	7,955	4,938	3,236
Inventory write-offs and write-downs	12,820	20,133	19,547
Loss on firm purchase commitments	42,811	0	0
Change in the fair value of the derivatives	3,308	(31,729)	0
Gain or write-off on sale or disposal of property and equipment	166	(51)	1,522
Gain on extinguishment of debt	(22,303)	(148,660)	0
Share-based compensation, including restructuring costs	8,706	139,135	207,132
Impairment of long-lived assets	7,513	0	0
Loss from acquisition of EM4	48	(1,474)	0
Provision for credit loss	2,186	0	0
Gain from sale of investment	(2,908)	0	0
Change in product warranty and other	6,172	(2,790)	2,382
Reorganization Items	41,744	0	0
Changes in operating assets and liabilities:
Accounts receivable	8,312	916	(2,951)
Inventories	(4,866)	(19,306)	(22,951)
Prepaid expenses and other current assets	10,539	(4,990)	11,641
Other non-current assets	21,701	10,722	177
Accounts payable	14,436	(2,639)	3,657
Accrued and other current liabilities	(7,861)	(7,212)	9,158
Other non-current liabilities	(19,808)	(17,498)	(10,320)
Net cash used in operating activities	(196,454)	(276,630)	(247,304)
Cash flows from investing activities:
Purchases of marketable securities	(54,268)	(130,404)	(301,493)
Proceeds from maturities of marketable securities	128,120	177,932	520,286
Proceeds from sales/redemptions of marketable securities	23,625	3,421	52,356
Issuance of promissory notes	(2,100)	0	0
Proceeds from sales of equity investment	2,908	0	0
Purchases of property and equipment	(2,021)	(5,090)	(21,915)
Acquisition of EM4 (net of cash acquired)	242	(3,531)	0
Proceeds from disposal of property and equipment	305	135	0
Net cash provided by investing activities	96,811	42,463	236,626
Cash flows from financing activities:
Proceeds from sale of Class A common stock under ESPP	381	1,153	2,641
Payments of employee taxes related to stock-based awards	(1,054)	(1,997)	(2,137)
Net cash provided by financing activities	36,598	178,265	80,197
Net (decrease) increase in cash, cash equivalents and restricted cash	(63,045)	(55,902)	69,519
Beginning cash, cash equivalents and restricted cash	84,722	140,624	71,105
Ending cash, cash equivalents and restricted cash	21,677	84,722	140,624
Conversion of 2026 Convertible Senior Notes [Member]
Cash flows from financing activities:
Repurchase of 2026 Convertible Senior Notes	(30,297)	0	0
Common Class A [Member]
Cash flows from financing activities:
Proceeds from issuance of Series A preferred stock, net of issuance costs, discount and commitment fees	31,415	0	0
Equity Financing Program [Member] | Common Class A [Member]
Cash flows from financing activities:
Net proceeds from issuance of Class A common stock under the Equity Financing Program	36,153	89,359	$ 50,190
Debtor-in-Possession [Member]
Cash flows from operating activities:
Net loss	(354,608)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	13,663
Amortization of operating lease right-of-use assets	4,281
Amortization of discount on marketable securities	(1,099)
Loss on marketable securities	690
Vendor stock in lieu of cash program	12,785
Amortization of debt discount and issuance costs	7,955
Inventory write-offs and write-downs	12,458
Loss on firm purchase commitments	42,811
Change in the fair value of the derivatives	3,308
Gain or write-off on sale or disposal of property and equipment	166
Gain on extinguishment of debt	(22,303)
Share-based compensation, including restructuring costs	8,706
Impairment of long-lived assets	5,233
Loss from acquisition of EM4	48
Provision for credit loss	2,186
Gain from sale of investment	(2,908)
Change in product warranty and other	6,202
Reorganization Items	41,744
Changes in operating assets and liabilities:
Accounts receivable	5,689
Inventories	(4,818)
Prepaid expenses and other current assets	9,952
Other non-current assets	21,504
Accounts payable	22,614
Accrued and other current liabilities	(5,226)
Other non-current liabilities	(17,402)
Net cash used in operating activities	(197,790)
Cash flows from investing activities:
Purchases of marketable securities	(54,268)
Proceeds from maturities of marketable securities	128,120
Proceeds from sales/redemptions of marketable securities	23,625
Issuance of promissory notes	(2,100)
Proceeds from sales of equity investment	2,908
Purchases of property and equipment	(1,747)
Acquisition of EM4 (net of cash acquired)	242
Proceeds from disposal of property and equipment	305
Net cash provided by investing activities	97,085
Cash flows from financing activities:
Proceeds from sale of Class A common stock under ESPP	381
Payments of employee taxes related to stock-based awards	(1,054)
Net cash provided by financing activities	36,598
Net (decrease) increase in cash, cash equivalents and restricted cash	(64,107)
Beginning cash, cash equivalents and restricted cash	72,001
Ending cash, cash equivalents and restricted cash	7,894	$ 72,001
Debtor-in-Possession [Member] | Non-debtor Affiliates [Member]
Changes in operating assets and liabilities:
Accounts receivable	(11,421)
Debtor-in-Possession [Member] | Conversion of 2026 Convertible Senior Notes [Member]
Cash flows from financing activities:
Repurchase of 2026 Convertible Senior Notes	(30,297)
Debtor-in-Possession [Member] | Common Class A [Member]
Cash flows from financing activities:
Proceeds from issuance of Series A preferred stock, net of issuance costs, discount and commitment fees	31,415
Debtor-in-Possession [Member] | Equity Financing Program [Member] | Common Class A [Member]
Cash flows from financing activities:
Net proceeds from issuance of Class A common stock under the Equity Financing Program	$ 36,153