CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net loss	$ (229,506)	$ (229,813)
Adjustment to reconcile net loss to net cash used in operating activities
Stock-based compensation	14,057	13,794
Depreciation and amortization	9,751	6,814
Loss from write-down of property, plant and equipment	7,159	6,846
Amortization of right-of-use assets	1,023	865
Commitment fee for SEPA settled by common stock - related party	0	1,061
Loss on debt extinguishment	3,510	942
Change in fair value of warrants	24,980	(848)
Change in fair value of derivatives - related parties	(9,983)	(10,880)
Other	1,850	(397)
Changes in operating assets and liabilities:
Prepaid expenses	1,207	304
Inventory	6,190	(10,284)
Accounts receivable	(1,713)	234
Vendor deposits	(2,377)	6,808
Contract assets	(6,322)	(631)
Grant receivable	(2,993)	0
Accounts payable	(11,475)	19,516
Accrued expenses	19,349	5,079
Accounts payable and accrued expenses-related parties	0	(1,200)
Operating lease liabilities	(1,130)	(785)
Contract liabilities	1,804	3,957
Note payable	0	(19,637)
Other receivables	(7,500)	0
Other	(4,774)	(1,387)
Net cash used in operating activities	(145,018)	(196,857)
Cash flows from investing activities
Investment in notes receivable	0	(261)
Proceeds from notes receivable	0	3,163
Purchases of intangible assets	(138)	0
Purchases of property, plant and equipment	(29,323)	(20,072)
Net cash used in investing activities	(29,461)	(17,170)
Cash flows from financing activities
Proceeds from issuance of convertible notes payable – related party, net of discount	48,050	9,310
Proceeds received from the Senior Secured Term Loan, net of discount	0	97,992
Principal payments on finance lease obligations	(96)	(14)
Proceeds from equipment financing facility	0	4,216
Repayment of equipment financing facility	(2,867)	(1,913)
Issuance of common stock and warrants	192,167	43,626
Payment of equity issuance costs	(5,003)	0
Proceeds from exercise of stock options	462	0
Proceeds from exercise of public warrants	0	7
Repurchase of shares from employees for income tax withholding purposes	(633)	(978)
Net cash provided by financing activities	227,918	139,544
Effect of foreign exchange on cash, cash equivalents and restricted cash	5	14
Net increase (decrease) in cash, cash equivalents and restricted cash	53,444	(74,469)
Cash, cash equivalents and restricted cash, beginning of year	31,223	105,692
Cash, cash equivalents and restricted cash, end of year	84,667	31,223
Non-cash investing and financing activities:
Right-of-use operating lease assets in exchange for lease liabilities	718	2,112
Fixed assets acquired with finance lease	125	147
Accrued and unpaid capital expenditures	548	2,626
Issuance of convertible notes for interest paid-in-kind	10,327	6,267
Issuance of common stock upon settlement of Yorkville Convertible Notes	51,023	7,534
Accrued and unpaid debt issuance costs	0	5,536
Supplemental disclosures
Cash paid for interest	15,133	5,766
Nonrelated Party
Adjustment to reconcile net loss to net cash used in operating activities
Issuance of convertible notes for interest paid-in-kind	4,972	1,886
Cash flows from financing activities
Payment of debt issuance costs	(3,046)	(12,398)
Related Party
Adjustment to reconcile net loss to net cash used in operating activities
Issuance of convertible notes for interest paid-in-kind	36,903	10,899
Cash flows from financing activities
Payment of debt issuance costs	$ (1,116)	$ (304)