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Investments and Fair Value Instruments - Summary of Changes in Fair Value and Other Adjustments of Liabilities (Detail) - Level 3 [Member] $ in Thousands | 9 Months Ended
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Sep. 30, 2022 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | $ 5,463
Initial recognition | 4,015
Change in fair value and other adjustments | (1,950)
Ending Balance | 4,135
Common Stock Warrant Liability [Member] | March 2018 Purchase Agreement [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 7
Initial recognition | 0
Change in fair value and other adjustments | 0
Ending Balance | 0
Common Stock Warrant Liability [Member] | June 2019 Offering [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 170
Initial recognition | 0
Change in fair value and other adjustments | 0
Ending Balance | 0
Common Stock Warrant Liability [Member] | September 2019 Offering [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 223
Initial recognition | 0
Change in fair value and other adjustments | 0
Ending Balance | 0
Common Stock Warrant Liability [Member] | January 2021 Offering [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 2,993
Initial recognition | 0
Change in fair value and other adjustments | 0
Ending Balance | 0
August 2022 Options [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 0
Initial recognition | 3,824
Change in fair value and other adjustments | (1,791)
Ending Balance | 2,033
August 2022 Placement Agent Options [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 0
Initial recognition | 191
Change in fair value and other adjustments | (89)
Ending Balance | 102
Contingent Liabilities [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 2,070
Initial recognition | 0
Change in fair value and other adjustments | (70)
Ending Balance | 2,000
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | (3,392)
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] | Common Stock Warrant Liability [Member] | March 2018 Purchase Agreement [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | (7)
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] | Common Stock Warrant Liability [Member] | June 2019 Offering [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | (170)
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] | Common Stock Warrant Liability [Member] | September 2019 Offering [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | (223)
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] | Common Stock Warrant Liability [Member] | January 2021 Offering [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | (2,993)
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] | August 2022 Options [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | 0
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] | August 2022 Placement Agent Options [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | 0
ASU 2020-06 [Member] | Reclassification upon Adoption [Member] | Contingent Liabilities [Member] |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Ending Balance | $ 0

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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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