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BALANCE SHEET COMPONENTS - Other Current Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Other current liabilities |  |  |
System advances |  | $ 640 | $ 1,493
Lease liabilities - current portion |  | 333 | 645
Due to related parties |  | 399 | 190
Other |  | 217 | 308
Total other current liabilities | $ 1,069 | $ 1,589 | $ 2,636
Current portion of operating lease liabilities included within other current liabilities |  | Lease liabilities - current portion |

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