Annual report pursuant to Section 13 and 15(d)

Significant Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details)

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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
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