CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities
Net loss	$ (18,875)	$ (17,618)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	4,233	4,677
Depreciation and amortization	4,451	4,575
Amortization of marketable securities discount	0	(114)
Other noncash expense	656	234
Changes in operating assets and liabilities:
Accounts receivable	135	(429)
Inventories	(55)	1,650
Prepaid expenses and other current assets, deposits and other assets	(3,297)	(2,193)
Accounts payable, accrued expenses and non-current liabilities	(3,326)	446
Net cash used in operating activities	(16,078)	(8,772)
Investing Activities
Acquisitions of property, plant and equipment	(17,512)	(22,093)
Proceeds from maturity of marketable securities	0	135,550
Proceeds from sale of property, plant and equipment	0	67
Net cash (used in) provided by investing activities	(17,512)	113,524
Financing Activities
Payment of loans payable	(32)	(39)
Payment of finance lease liabilities	(23)	(23)
Repurchases of common stock	(1,397)	0
Net cash used in by financing activities	(1,452)	(62)
Net (decrease) increase in cash and cash equivalents	(35,042)	104,690
Cash, cash equivalents and restricted cash at beginning of period	375,597	315,376
Cash, cash equivalents and restricted cash at end of period	340,555	420,066
Schedule of cash, cash equivalents and restricted cash
Cash and cash equivalents	270,642	342,298
Restricted cash (current)		1,032
Restricted cash (non-current)	69,913	76,736
Total cash, cash equivalents and restricted cash	340,555	420,066
Supplemental disclosures of cash and non-cash investing and financing transactions
Cash paid for interest	770	515
Non-cash purchase of property, plant and equipment	9,554	13,277
Right-of-use asset purchased with operating lease	$ 35	$ 0