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Selected Balance Sheet Components - Schedule of Deposits and Other Noncurrent Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Balance Sheet Related Disclosures [Abstract] |  |
Restricted cash and security deposit for the Irvine Lease (Note 14) | $ 1,850 | $ 1,850
Long-term prepaid maintenance contracts | 97 | 118
Other | 88 | 88
Total deposits and other noncurrent assets | $ 2,035 | $ 2,056

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