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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
OPERATING ACTIVITIES |  |  |
Net loss | $ (124,054) | $ (101,211) | $ (156,124)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization expense | 45,434 | 24,473 | 17,736
Non-cash interest expense, including interest expenses associated with debt issuance costs | 1,901 | 9,648 | 10,044
Stock-based compensation | 28,661 | 13,546 | 4,542
Change in fair value of warrant liability and embedded derivative | 0 | (3,424) | 84,455
Non-cash lease expense | 2,328 | 896 | 589
Accretion of asset retirement obligations | 243 | 229 | 217
Impairment loss of energy storage systems | 2,571 | 4,320 | 1,395
Loss on disposal of property, plant and equipment | 276 | 0 | 0
Impairment loss of project assets | 502 | 0 | 0
Issuance of warrants for services | 0 | 9,183 | 0
Net (accretion of discount) amortization of premium on investments | (123) | 664 | 0
Income tax benefit from release of valuation allowance | (15,100) | 0 | 0
Provision for accounts receivable allowance | 3,590 | 0 | 0
Other | 3 | (50) | (129)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (155,817) | (48,125) | (6,988)
Inventory | 18,606 | (1,877) | (17,263)
Deferred costs with suppliers | (37,134) | (7,540) | (2,615)
Other assets | (29,420) | (17,243) | (2,714)
Contract origination costs, net | (9,612) | (2,622) | (2,552)
Project assets | (3,711) | 0 | 0
Accounts payable | 53,260 | 16,329 | 201
Accrued expense and other liabilities | 62,210 | 17,007 | 4,499
Deferred revenue | 51,005 | (14,967) | 31,682
Operating lease liabilities, net | (1,649) | (502) | (646)
Net cash used in operating activities | (106,030) | (101,266) | (33,671)
INVESTING ACTIVITIES |  |  |
Acquisition of AlsoEnergy, net of cash acquired | (533,009) | 0 | 0
Purchase of available-for-sale investments | (220,640) | (189,858) | 0
Proceeds from maturities of available-for-sale investments | 219,264 | 0 | 0
Proceeds from sales of available-for-sale investments | 10,930 | 16,011 | 0
Purchase of energy storage systems | (2,606) | (3,604) | (6,196)
Capital expenditures on internally-developed software | (16,767) | (5,970) | (5,828)
Purchase of equity method investment | (50) | (1,212) | 0
Purchase of property and equipment | (1,495) | (600) | (12)
Net cash used in investing activities | (544,373) | (185,233) | (12,036)
FINANCING ACTIVITIES |  |  |
Proceeds from exercise of stock options and warrants | 1,276 | 148,532 | 422
Payments for taxes related to net share settlement of stock options | (2,302) | (12,622) | 0
Net contributions from Merger and PIPE financing, net of transaction costs of $58,061 | 0 | 550,322 | 0
Proceeds from financing obligations | 1,519 | 7,839 | 16,222
Repayment of financing obligations | (10,306) | (9,587) | (10,689)
Proceeds from issuance of convertible notes, net of issuance costs of $0, $14,299 and $240 for the years ended December 31, 2022, 2021 and 2020, respectively | 0 | 446,827 | 33,081
Purchase of capped call options | 0 | (66,700) | 0
Proceeds from issuance of notes payable, net of issuance costs of $0, $0 and $1,502 for the years December 31, 2022, 2021 and 2020, respectively | 0 | 3,930 | 23,498
Investment from non-controlling interests | 541 | 0 | 0
Repayment of notes payable | 0 | (41,446) | (22,240)
Net cash (used in) provided by financing activities | (9,272) | 1,027,095 | 40,294
Effect of exchange rate changes on cash and cash equivalents | (202) | 242 | (534)
Net (decrease) increase in cash and cash equivalents | (659,877) | 740,838 | (5,947)
Cash and cash equivalents, beginning of year | 747,780 | 6,942 | 12,889
Cash and cash equivalents, end of period | 87,903 | 747,780 | 6,942
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION |  |  |
Cash paid for interest | 6,407 | 10,188 | 9,665
Cash paid for income taxes | 285 | 0 | 2
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |
Change in asset retirement costs and asset retirement obligation | 116 | 231 | 1,839
Exchange of warrants for common stock | 0 | 168,647 | 0
Conversion of warrants upon Merger | 0 | 60,568 | 0
Conversion of convertible notes upon Merger | 0 | 77,748 | 0
Conversion of accrued interest into outstanding note payable | 0 | 337 | 644
Right-of-use asset obtained in exchange for lease liability | 428 | 13,337 | 0
Settlement of warrant liability into common stock due to exercise | 0 | 167,050 | 0
Settlement of warrant liability into common stock due to redemption | 0 | 2,121 | 0
Issuance of common stock warrants | 0 | 0 | 168
Stock-based compensation capitalized to internal-use software | 2,983 | 1,160 | 0
Purchase of energy storage systems in accounts payable | $ 172 | $ 0 | $ 1,806

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