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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
OPERATING ACTIVITIES |  |
Net loss | $ (182,769) | $ (36,452)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization expense | 10,315 | 7,918
Non-cash interest expense, including interest expenses associated with debt issuance costs | 7,119 | 4,570
Stock-based compensation | 1,784 | 932
Change in fair value of warrant liability and embedded derivative | 133,577 | 909
Noncash lease expense | 334 | 286
Accretion expense | 112 | 160
Impairment of energy storage systems | 1,275 | 947
Issuance of warrants for services | 9,183 | 0
Changes in operating assets and liabilities: |  |
Accounts receivable | (4,219) | 2,212
Inventory | (6,323) | (6,340)
Other assets | (16,924) | (2,691)
Contract origination costs | (1,650) | (1,383)
Accounts payable and accrued expenses | 3,292 | 412
Deferred revenue | 3,294 | 12,308
Lease liabilities | (289) | (310)
Other liabilities | 56 | 25
Net cash used in operating activities | (41,833) | (16,497)
INVESTING ACTIVITIES |  |
Purchase of energy storage systems | (5,603) | (7,555)
Capital expenditures on internally-developed software | (2,693) | (2,628)
Purchase of property and equipment | (300) | 0
Net cash used in investing activities | (8,596) | (10,183)
FINANCING ACTIVITIES |  |
Proceeds from exercise of stock options and warrants | 2,933 | 54
Net contributions from Merger and PIPE financing, net of transaction costs of $58,061 | 550,322 | 0
Proceeds from financing obligations | 4,929 | 8,391
Repayment of financing obligations | (4,609) | (4,267)
Proceeds from issuance of convertible notes, net of issuance costs of $8 and $911 for the six months ended June 30, 2021 and 2020, respectively | 1,118 | 14,050
Proceeds from issuance of notes payable, net of issuance costs of $101 and $1,502 for the six months ended June 30, 2021 and 2020, respectively | 3,940 | 23,498
Repayment of notes payable | (41,446) | (19,665)
Net cash provided by financing activities | 517,187 | 22,061
Effect of exchange rate changes on cash and cash equivalents | 438 | (176)
Net increase (decrease) in cash and cash equivalents | 467,196 | (4,795)
Cash and cash equivalents, beginning of period | 6,942 | 12,889
Cash and cash equivalents, end of period | 474,138 | 8,094
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION |  |
Cash paid for interest | 7,131 | 4,534
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |
Change in asset retirement costs and asset retirement obligation | 71 | 76
Exchange of warrants for common stock | 168,647 | 0
Conversion of warrants upon merger | 60,568 | 0
Conversion of convertible notes upon merger | 77,748 | 0
Conversion of accrued interest into outstanding note payable | 337 | 128
Right-of-use asset obtained in exchange for lease liability | 1,230 | 0
Settlement of warrant liability into preferred stock due to exercise | $ 253 | $ 0
Issuance of warrants upon debt modification | 0 | 168,000
Stock-based compensation capitalized to internal-use software | $ 47 | $ 0

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