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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net loss | $ (84,746) | $ (77,502) | $ (52,992)
Adjustments to reconcile net loss to net cash used in operating activities |  |  |
Equity-based compensation | 10,840 | 22,636 | 5,626
Non-cash issuance of shares | 0 | 333 | 333
Fair value change of warrants | 5,842 | 1,476 | 11,554
Depreciation expense | 3,613 | 2,281 | 1,896
Accretion of debt instrument discounts | 237 | 223 | 48
Amortization of debt issuance costs | 767 | 2,389 | 173
(Accretion) amortization of (discount) premium on debt securities | (432) | 584 | 0
Operating lease amortization expense | 1,596 |  |
Issuance costs attributable to warrants | 0 | 109 | 0
Gain on extinguishment of secured term loan | 0 | (314) | 0
Amortization of beneficial conversion feature | 0 | 0 | 648
Loss on exercise of warrants | 0 | 0 | 211
Changes in operating assets and liabilities |  |  |
Prepaid expenses and other current assets | (2,171) | (2,265) | 275
Prepaid expenses and other non-current assets | 52 | (2,645) | (890)
Accounts payable | 85 | (293) | 234
Accrued expenses | 1,201 | (9,320) | 14,725
Accrued interest | 0 | 2,801 | 206
Deferred revenue | 0 | 5,000 | 0
Operating right-of-use liabilities | (2,362) | 0 | 0
Net cash used in operating activities | (65,478) | (54,507) | (17,953)
Cash flows from investing activities |  |  |
Purchase of property, plant, and equipment | (287,189) | (137,388) | (29,812)
Purchase of debt securities, available for sale | (192,388) | (229,183) | 0
Maturity of debt securities, available for sale | 188,509 | 37,800 | 0
Sale of debt securities, available for sale | 72,681 | 23,196 | 0
Net cash used in investing activities | (218,387) | (305,575) | (29,812)
Cash flows from financing activities |  |  |
Proceeds from issuance of common stock | 206,071 | 1,000 | 107,170
Proceeds from issuance of warrants | 43,929 | 0 | 0
Payments to repurchase shares | (1,639) | (1,695) | 0
Common stock issuance costs | (775) | 0 | 0
Other (payments) proceeds from financing activities | (56) | 238 | 298
Proceeds from ROCH and PIPE financing, net of issuance costs | 0 | 298,461 | 0
Bond issuance costs | 0 | (4,067) | (8,550)
Convertible notes issuance costs | 0 | (480) | (3,358)
Payments on promissory notes | 0 | (91) | (6,142)
Issuance of bonds | 0 | 0 | 244,075
Issuance of convertible notes | 0 | 0 | 60,000
Payments on promissory note from related parties | 0 | 0 | (12,600)
Payments on advances from related parties | 0 | 0 | (2,704)
Net cash provided by financing activities | 247,530 | 293,366 | 378,189
Net (decrease) increase in cash and restricted cash | (36,335) | (66,716) | 330,424
Cash and restricted cash, beginning of period | 263,858 | 330,574 | 150
Cash and restricted cash, end of period | 227,523 | 263,858 | 330,574
Non-cash operating activities |  |  |
Interest paid during the period, net of capitalized interest | 1,300 | 1,495 | 2,141
Non-cash investing activities |  |  |
Additions to property, plant, and equipment in accrued expenses | 26,386 | 29,797 | 11,893
Additions to property, plant, and equipment in accounts payable | 817 | 636 | 0
Additions to property, plant, and equipment in accrued interest | 1,424 | 1,424 | 3,849
Non-cash financing activities |  |  |
Issuance of common stock on conversion of convertible notes | 0 | 61,796 | 0
PIK interest on convertible notes | 0 | 3,492 | 0
Initial fair value of acquired warrant liability | 0 | 4,604 | 0
Issuance of shares upon exercise of warrants | 0 | 0 | 18,173
Beneficial conversion feature of convertible notes |  |  | 31,075
Conversion of accounts payable to promissory notes | 0 | 0 | 1,541
Capitalization of bond issuance costs — additions to accrued expense | $ 0 | $ 0 | $ 2,646

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