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Commitment & Contingencies - Facility Leases (Details) $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2020 USD ($) | Dec. 31, 2020 USD ($) contract | Jun. 30, 2021 USD ($) contract | Jun. 30, 2020 USD ($) | Jan. 31, 2021
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  |  |  |  | 6 months
Impairment of operating lease right-of-use asset |  | $ 15 |  |  |
Operating lease right-of-use asset obtained in exchange for operating lease liability | $ 600 |  | $ 0 | $ 767 |
Weighted average remaining lease term |  | 2 years 10 months | 2 years 7 months |  |
Estimated incremental borrowing rate |  |  | 10.00% |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |
2021 (remaining six months) |  |  | $ 140 |  |
2022 |  |  | 271 |  |
2023 |  |  | 281 |  |
2024 |  |  | 25 |  |
2025 |  |  | 0 |  |
Total future lease payments, undiscounted |  |  | 717 |  |
(Less): Imputed interest |  |  | (83) |  |
Present value of operating lease payments |  |  | $ 634 |  |
Irvine office and laboratory facility |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of leases | contract |  | 3 |  |  |
Other facility leases |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of leases not impaired | contract |  |  | 2 |  |

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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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