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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
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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- Definition

Deposits and other noncurrent assets.

+ References

No definition available.

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- Definition

Restricted cash and security deposit for lease.

+ References

No definition available.

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- References

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- Definition

Amount of noncurrent assets classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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