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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
OPERATING ACTIVITIES |  |
Net loss | $ (156,124) | $ (59,414)
Adjustments to reconcile net loss to net cash used in operating activities |  |
Depreciation and amortization expense | 17,736 | 13,889
Non-cash interest expense, including interest expense associated with debt issuance costs | 10,044 | 4,759
Stock-based compensation | 4,542 | 1,531
Change in fair value of warrant liability and embedded derivative | 84,455 | (1,493)
Noncash lease expense | 589 | 906
Accretion expense | 217 | 303
Impairment of energy storage systems | 1,395 | 295
Earnings from equity method investments | (129) | (76)
Changes in operating assets and liabilities |  |
Accounts receivable | (6,988) | (5,112)
Inventory | (17,263) | (1,553)
Other assets | (5,329) | (1,860)
Contract origination costs | (2,552) | (1,302)
Accounts payable and accrued expenses | 5,684 | 10,562
Deferred revenue | 31,682 | 9,007
Lease liabilities | (646) | (230)
Other liabilities | (984) | 110
Net cash used in operating activities | (33,671) | (29,678)
INVESTING ACTIVITIES |  |
Capital expenditures on internally-developed software | (5,828) | (5,356)
Net cash used in investing activities | (12,036) | (46,358)
FINANCING ACTIVITIES |  |
Proceeds from exercise of stock options and warrants | 422 | 36
Net cash provided by financing activities | 40,294 | 67,201
Effect of exchange rate changes on cash and cash equivalents | (534) | (170)
Net decrease in cash and cash equivalents | (5,947) | (9,005)
Cash and cash equivalents, beginning of year | 12,889 | 21,894
Cash and cash equivalents, end of year of year | 6,942 | 12,889
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION |  |
Cash paid for income taxes | 2 | 3
Cash paid for interest | 9,665 | 8,937
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |
Change in asset retirement costs and asset retirement obligation | 1,839 | (636)
Issuance of common stock warrants | 168 | 1,216
Conversion of convertible promissory notes and accrued interest into Series D preferred stock |  | 28,144
Conversion of accrued interest into outstanding note payable | 644 |
Purchase of energy storage systems in accounts payable | 1,806 | 950
Energy Storage Systems |  |
INVESTING ACTIVITIES |  |
Purchase of property and equipment | (6,196) | (40,995)
Other property and equipment |  |
INVESTING ACTIVITIES |  |
Purchase of property and equipment | (12) | (7)
Financing obligation |  |
FINANCING ACTIVITIES |  |
Proceeds from issuance of financing obligations | 16,222 | 32,310
Repayment of debt | (10,689) | (7,309)
Convertible promissory notes |  |
FINANCING ACTIVITIES |  |
Proceeds from issuance of debt, net of issuance costs | 33,081 | 63,250
Notes payable |  |
FINANCING ACTIVITIES |  |
Repayment of debt | (22,240) | (25,796)
Proceeds from issuance of debt, net of issuance costs | $ 23,498 | $ 4,710

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