CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities
Net loss	$ (28,834)	$ (28,310)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss on disposal of assets	0	4,954
(Gain) on forgiveness of SBA Loans	0	(641)
Stock-based compensation	7,945	1,617
Depreciation and amortization	2,916	2,372
Noncash interest expense	2,637	0
Other noncash (income) expense	352	(41)
Changes in operating assets and liabilities:
Accounts receivable	790	(320)
Inventories	102	275
Prepaid expenses and other current assets, deposits and other assets	(1,828)	(3,142)
Accounts payable, accrued expenses and long-term liabilities	(1,194)	3,768
Net cash used in operating activities	(17,114)	(19,468)
Investing Activities
Acquisitions of property, plant and equipment	(46,165)	(14,167)
Acquisition of patent portfolio	(10)	0
Proceeds from sale and maturity of marketable securities	169,082	0
Purchase of marketable securities	(131,257)	(422,362)
Net cash used in investing activities	(8,350)	(436,529)
Financing Activities
Proceeds from issuance of 2021 Bonds	0	68,995
Debt and equity offering costs	(10,993)	(34,757)
Proceeds from issuance of common stock and common stock warrants	150,000	487,549
Proceeds from exercise of warrants	3	1,119
Net settlement of common stock under stock plans	(286)	0
Payment of loans payable - other	(72)	(53)
Payment of finance lease liabilities	(87)	0
Net cash provided by financing activities	138,565	522,853
Net increase (decrease) in cash and cash equivalents	113,101	66,856
Cash, cash equivalents and restricted cash at beginning of period	136,033	78,338
Cash, cash equivalents and restricted cash at end of period	249,134	145,194
Schedule of cash, cash equivalents and restricted cash
Cash and cash equivalents	172,984	17,085
Restricted cash (current)	5,894	57,645
Long-term restricted cash	70,256	70,464
Total cash, cash equivalents and restricted cash	249,134	145,194
Supplemental disclosures of cash and non-cash investing and financing transactions
Cash paid for interest	757	9
Cash paid for interest capitalized to construction in progress	752	0
Non-cash interest capitalized to construction in progress	511	0
Non-cash purchase of property, plant and equipment	11,643	5,052
Right-of-use asset purchased with financing leases	834	27,775
Right-of-use asset purchased with operating lease	$ 0	$ 1,562