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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