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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
OPERATING ACTIVITIES    
Net loss $ (82,553) $ (17,471)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 5,079 3,994
Non-cash interest expense, including interest expenses associated with debt issuance costs 3,902 2,116
Stock-based compensation 760 456
Change in fair value of warrant liability and embedded derivative 66,397 (1,009)
Noncash lease expense 160 141
Accretion expense 50 114
Impairment of energy storage systems 613 237
Changes in operating assets and liabilities:    
Accounts receivable (955) 206
Inventory (1,466) (5,104)
Other assets (4,690) (2,660)
Contract origination costs (779) (742)
Accounts payable and accrued expenses 8,640 1,081
Deferred revenue 2,992 8,016
Lease Liabilities (176) (152)
Other liabilities 199 107
Net cash used in operating activities (1,827) (10,670)
INVESTING ACTIVITIES    
Purchase of energy storage systems (1,525) (1,911)
Capital expenditures on internally-developed software (1,238) (1,399)
Net cash used in investing activities (2,763) (3,310)
FINANCING ACTIVITIES    
Proceeds from exercise of stock options and warrants 2,894 21
Proceeds from financing obligations 2,732 3,912
Repayment of financing obligations (3,369) (1,860)
Proceeds from issuance of convertible notes, net of issuance costs of $8 and $238 for the three months ended March 31, 2021 and 2020, respectively 1,118 14,050
Proceeds from issuance of notes payable 3,879  
Repayment of notes payable (161) (3,968)
Net cash provided by financing activities 7,093 12,155
Effect of exchange rate changes on cash and cash equivalents 428 (184)
Net decrease in cash and cash equivalents 2,931 (2,009)
Cash and cash equivalents, beginning of year 6,942 12,889
Cash and cash equivalents, end of year of year 9,873 10,880
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid for interest 1,480 1,895
NON-CASH INVESTING AND FINANCING ACTIVITIES    
Change in asset retirement costs and asset retirement obligation 37 4
Purchases of energy storage systems in accounts payable 1,260 $ 66
Conversion of accrued interest into outstanding note payable 256  
Settlement of warrant liability into preferred stock due to exercise 253  
Stock-based compensation capitalized to internal-use software $ 24