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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