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Significant Balance Sheet Components - Schedule of Prepaids and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Significant Balance Sheet Components [Abstract] |  |
Deposits for manufacturing inventory | $ 897 | $ 4,294
Prepaid taxes | 1,031 | 606
Refundable value added taxes | 1,376 | 2,561
Prepaid licenses and royalties | 761 | 1,128
Director & officer insurance | 604 |
Prepaid parts (direct buy) | 536 | 458
Other | 1,225 | 1,064
Total prepaids and other current assets | $ 6,430 | $ 10,111

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