CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net loss	$ (47,738)	$ (72,620)
Adjustments to reconcile net loss to net cash used in operating activities:
Impairment loss	0	24,749
Stock-based compensation	12,752	12,624
Depreciation and amortization	14,323	4,452
Amortization of marketable securities (discount) premium	(102)	2,755
Other noncash expense (income)	655	(153)
Changes in operating assets and liabilities:
Accounts receivable	(1,766)	626
Inventories	1,137	(338)
Prepaid expenses and other current assets, deposits and other assets	(816)	(5,078)
Accounts payable, accrued expenses and non-current liabilities	427	207
Net cash used in operating activities	(21,128)	(32,776)
Investing Activities
Acquisitions of property, plant and equipment	(61,413)	(76,837)
Acquisition of patent portfolio	0	(10)
Proceeds from maturity of marketable securities	168,550	243,817
Purchase of marketable securities	0	(130,402)
Proceeds from sale of property, plant and equipment	34	0
Net cash provided by investing activities	107,171	36,568
Financing Activities
Debt and equity offering costs	0	(10,993)
Proceeds from issuance of common stock and common stock warrants	0	150,000
Proceeds from exercise of warrants	0	3
Net settlement of common stock under stock plans	0	(285)
Payment of loans payable	(128)	(112)
Payment of finance lease liabilities	(22)	(8)
Net cash (used in) provided by financing activities	(150)	138,605
Net increase in cash and cash equivalents	85,893	142,397
Cash, cash equivalents and restricted cash at beginning of period	315,376	136,033
Cash, cash equivalents and restricted cash at end of period	401,269	278,430
Schedule of cash, cash equivalents and restricted cash
Cash and cash equivalents	323,510	200,564
Restricted cash (current)	77,759	1,024
Restricted cash (non-current)		76,842
Total cash, cash equivalents and restricted cash	401,269	278,430
Supplemental disclosures of cash and non-cash investing and financing transactions
Cash paid for interest, net of amounts capitalized	1,028	770
Non-cash purchase of property, plant and equipment	15,593	11,136
Right-of-use asset purchased with operating lease	$ 199	$ 0