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Balance Sheets Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]
Advance to suppliers	$ 339	$ 853
Prepaid expenses	1,700	1,074
Other current assets	805	722
Total prepaid expenses and other current assets	$ 2,844	$ 2,649

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- Definition

Prepayments to suppliers.

+ References

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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