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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