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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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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Indicates line item in statement of financial position that includes current operating lease liability.

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