CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Activities
Net loss	$ (21,002)	$ (14,420)	$ (39,877)	$ (32,038)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation			8,699	8,620
Depreciation and amortization	4,277	4,754	8,728	9,329
Amortization of marketable securities discount				(102)
Other noncash expense			1,276	351
Changes in operating assets and liabilities:
Accounts receivable			341	(535)
Inventories			243	1,136
Prepaid expenses and other current assets, deposits and other assets			(5,941)	(1,342)
Accounts payable, accrued expenses and non-current liabilities			(989)	(3,392)
Net cash used in operating activities			(27,520)	(17,973)
Investing Activities
Acquisitions of property, plant and equipment			(26,708)	(40,529)
Proceeds from maturity of marketable securities				168,550
Proceeds from sale of property, plant and equipment				112
Net cash (used in) provided by investing activities			(26,708)	128,133
Financing Activities
Proceeds from issuance of Remarketed Bonds			68,155
Extinguishment of 2021 Bonds			(68,155)
Payment of debt offering costs			(1,665)
Payment of loans payable			(65)	(80)
Payment of finance lease liabilities			(255)	(22)
Repurchases of common stock			(4,064)
Net cash used in financing activities			(6,049)	(102)
Net (decrease) increase in cash and cash equivalents			(60,277)	110,058
Cash, cash equivalents and restricted cash at beginning of period			375,597	315,376
Cash, cash equivalents and restricted cash at end of period	315,320	425,434	315,320	425,434
Schedule of cash, cash equivalents and restricted cash
Cash and cash equivalents	245,676	347,665	245,676	347,665
Restricted cash (current)	1,489	71,201	1,489	71,201
Restricted cash (non-current)	68,155	6,568	68,155	6,568
Total cash, cash equivalents and restricted cash	$ 315,320	$ 425,434	315,320	425,434
Supplemental disclosures of cash and non-cash investing and financing transactions
Cash paid for interest			1,464	1,027
Non-cash purchase of property, plant and equipment			9,855	12,929
Right-of-use asset purchased with financing leases			2,444	0
Right-of-use asset purchased with operating lease			$ 32	$ 0