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Significant Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Significant Balance Sheet Components [Abstract] |  |
Deposits for manufacturing inventory | $ 1,041 | $ 1,133
Prepaid taxes | 544 | 641
Refundable value added taxes | 1,693 | 509
Prepaid – NRE | 350 | 2,629
Prepaid licenses and royalties | 552 | 728
Director and officer insurance | 770 | 862
Prepaid parts (direct buy) | 185 | 167
Other | 717 | 812
Total prepaid expenses and other current assets | $ 5,852 | $ 7,481

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