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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current assets          
Cash and cash equivalents $ 9,873 $ 6,942   $ 12,889  
Accounts receivable, net 14,567 13,572   6,619  
Inventory, net 22,309 20,843   3,580  
Other current assets (includes $123 and $483 due from related parties as of December 31, 2020 and 2019, respectively) 6,587 7,920   5,710  
Total current assets 53,336 49,277   28,798  
Energy storage systems, net 119,842 123,703   131,569  
Contract origination costs, net 10,981 10,404   8,608  
Goodwill 1,666 1,739   1,695 $ 1,625
Intangible assets, net 12,170 12,087   10,695  
Other noncurrent assets 14,395 8,640   6,682  
Total assets 212,390 205,850   188,047  
Current liabilities:          
Accounts payable 21,721 13,749   12,691  
Accrued liabilities 17,084 16,072   7,307  
Accrued payroll 6,512 5,976   5,573  
Notes payable, current portion 36,182 33,683   28,895  
Convertible promissory notes (includes $45,271 and $24,102 due to related parties as of December 31, 2020 and 2019, respectively) 68,868 67,590   34,925  
Financing obligation, current portion 18,052 14,914   6,373  
Operating Lease, Liability, Current   333   645  
Deferred revenue, current 38,762 36,942   10,948  
Other current liabilities (includes $399 and $190 due to related parties as of December 31, 2020 and 2019, respectively) 1,069 1,589   2,636  
Total current liabilities 208,250 190,515   109,348  
Deferred revenue, noncurrent 16,640 15,468   9,780  
Asset retirement obligation 4,150 4,137   5,759 6,092
Notes payable, noncurrent 6,418 4,612   6,568  
Financing obligation, noncurrent 70,059 73,128   74,640  
Lease liability, noncurrent 41 57   390  
Total liabilities 467,044 383,259   212,579  
Commitments and Contingencies (Note 18)    
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) 220,955 220,563   231,129 218,931
Stockholders' Deficit          
Series 1 convertible preferred stock, $0.00001 par value; 4,305 shares authorized as of December 31, 2020 and 2019; 2,961 shares issued and outstanding as of December 31, 2020 and 2019 0 0      
Common stock, $0.000001 par value; 474,728,323 and 386,728,323 authorized as of December 31, 2020 and 2019, respectively; 11,228,371 and 9,392,682 issued and outstanding as of December 31, 2020 and 2019, respectively 0 0      
Additional paid-in capital 14,726 10,061   3,339  
Accumulated other comprehensive (loss) income 59 (192)   54  
Accumulated deficit (490,394) (407,841)   (259,054)  
Total stockholders' deficit (475,609) (397,972) $ (264,867) (255,661) $ (210,041)
Total liabilities, convertible preferred stock and stockholders' deficit $ 212,390 205,850   188,047  
Energy Storage Systems          
Current assets          
Energy storage systems, net   91,593   98,358  
Current liabilities:          
Deferred revenue, current   3,713   3,507  
Deferred revenue, noncurrent   $ 8,265   $ 6,302