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BALANCE SHEET COMPONENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
BALANCE SHEET COMPONENTS |
Schedule of balance sheet components | Inventory Inventory consists of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Work in process inventory | ​ | $ | 15,296 | ​ | $ | 2,535
Batteries |  | ​ | 5,547 |  | ​ | 1,045
Total inventory | ​ | $ | 20,843 |  | $ | 3,580
​ Other Current Assets Other current assets consist of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Deferred costs with suppliers | ​ | $ | 6,204 | ​ | $ | 3,589
Prepaid expenses |  | ​ | 698 |  | ​ | 868
Utility program deposits |  | ​ | 891 |  | ​ | 770
Due from related parties |  | ​ | 123 |  | ​ | 483
Other |  | ​ | 4 |  | ​ | —
Total other current assets | ​ | $ | 7,920 |  | $ | 5,710
​ Other Noncurrent Assets Other noncurrent assets consist of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Receivable from SPEs (Note 15) | ​ | $ | 3,583 | ​ | $ | 3,161
Deferred SPAC costs |  | ​ | 1,256 |  | ​ | —
Self-generation incentive program deposits |  | ​ | 1,036 |  | ​ | 864
Investment in VIEs |  | ​ | 744 |  | ​ | 843
Revolver debt issuance costs |  | ​ | 73 |  | ​ | 416
Right-of-use assets (Note 6) |  | ​ | 358 |  | ​ | 947
Property and equipment, net |  | ​ | 44 |  | ​ | 71
Other |  | ​ | 1,546 |  | ​ | 380
Total other noncurrent assets | ​ | $ | 8,640 | ​ | $ | 6,682
​ Depreciation expense for property and equipment was immaterial for both the years ended December 31, 2020 and 2019. Accrued Liabilities Accrued liabilities consist of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Accrued payables | ​ | $ | 9,799 | ​ | $ | 5,493
Accrued interest – notes payable |  | ​ | 6,149 |  | ​ | 1,757
Other accrued liabilities |  | ​ | 124 |  | ​ | 57
Total accrued liabilities | ​ | $ | 16,072 | ​ | $ | 7,307
​ Other Current Liabilities Other current liabilities consist of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
System advances | ​ | $ | 640 | ​ | $ | 1,493
Lease liabilities – current portion | ​ |  | 333 | ​ |  | 645
Due to related parties | ​ |  | 399 | ​ |  | 190
Other | ​ |  | 217 | ​ |  | 308
Total other current liabilities | ​ | $ | 1,589 | ​ | $ | 2,636

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