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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Operating activities:        
Net income (loss) $ 51,445 $ (19,953) $ (60,606) $ (14,901)
Adjustments to reconcile net loss to net cash used in operating activities:        
Changes in fair value of warrant liabilities     35,015  
Stock-based compensation 1,196 277 978 208
Bad debt expense 174     22
Depreciation and amortization expense 601 296 622 319
Contingent consideration (23) 85 796 80
Change in fair value of obligation to issue shares of common stock to sellers of World Energy 514      
Fair value change of derivative liability (74,731) 9,770 2,889 (819)
Loss on extinguishment of debt   212 1,038  
Change in operating right-of-use assets (2)      
Interest on finance leases 15      
Debt discount (60) 1,788 4,629 1,598
Investing activities:        
Payment to acquire net assets of World Energy (8,112)      
Accounts receivable, net 6,649 (664) (9,400) 2,610
Inventory, net (7,534) (236) (1,334) 215
Prepaid expenses and other current assets (6) (48) (1,250) 260
Other assets (18) (2) (2) 283
Accounts payable (901) 624 3,823 (1,089)
Accrued expenses and other current liabilities 2,206 27 2,749 (450)
Deferred revenue (69)   172 113
Net cash used in operating activities (20,544) (7,824) (19,881) (11,551)
Purchases of property and equipment (1,774) (127) (145) (28)
Net cash used in investing activities (9,886) (127) (145) (28)
Financing activities:        
Proceeds from the issuance of subordinated convertible promissory notes   8,850 8,100 10,000
Repayments to the issuance of subordinated convertible promissory notes     (11,250)  
Proceeds from paycheck protection program   1,100 1,100  
Repayments to paycheck protection program     (1,100)  
Proceeds from debt       2,500
Repayments of debt (63)   (3,177) (496)
Repayments under financing leases (151)      
Repayment of contingent consideration     (450)  
Repayments of revolving line of credit   (513) (2,500) (2,612)
Proceeds from revolving line of credit     2,500  
Proceeds from recapitalization of PIC shares 75   207,169  
Proceeds from issuance of common stock, net of issuance costs     144,891  
Payment of issuance costs in connection with term loans and revolving line of credit       (184)
Proceeds from exercise of stock options 23 1 114 10
Proceeds from exercise of Public Warrants 85,555      
Stockholder distribution       (10)
Proceeds from the exercise of warrants   34 884  
Net cash provided by financing activities 85,439 9,472 346,281 9,208
Net increase in cash and cash equivalents and restricted cash: 55,009 1,521 326,255 (2,371)
Cash, cash equivalents, and restricted cash, beginning of period 329,791 3,536 3,536 5,907
Cash, cash equivalents, and restricted cash at end of period 384,800 5,057 329,791 3,536
Supplemental disclosure of cash flow information:        
Cash paid for interest 15 58 389  
Supplemental disclosures of noncash investing and financing information:        
Issuance of warrants       38
Initial measurement of warrants assumed in connection with the Business Combination accounted for as liabilities     108,280  
Contingent and deferred consideration issued in connection with business combination       1,650
Issuance of stock in asset acquisition       109
Issuance costs in accrued expenses       $ 25
Conversion of convertible debt     17,446  
Retrospective recapitalization of stockholders’ equity     51,005  
Settlement of warrant liability upon exercise of Public Warrants 47,162      
Settlement of warrant liability upon call of warrants 591      
Reduce derivative liability for extinguishment of convertible notes payable   (1,349) (1,349)  
Increase derivative liability for issuance of convertible notes payable   $ 5,638 5,637  
Equipment financing $ 271      
Reduce derivative liability for the conversion and repayment of the convertible notes payable     $ (8,526)