Investments and Fair Value Instruments - Summary of Changes in Fair Value and Other Adjustments of Liabilities (Detail) - Level 3 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 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	(3,279)
Ending Balance	2,806
Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Ending Balance	(3,393)
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] | March 2018 Purchase Agreement [Member] | Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Ending Balance	(7)
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] | June 2019 Offering [Member] | Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Ending Balance	(170)
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] | September 2019 Offering [Member] | Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Ending Balance	(223)
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
Common Stock Warrant Liability [Member] | January 2021 Offering [Member] | Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Ending Balance	(2,993)
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
Contingent Liabilities [Member] | Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
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	(3,057)
Ending Balance	767
August 2022 Options [Member] | Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Ending Balance	0
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	(152)
Ending Balance	39
August 2022 Placement Agent Options [Member] | Reclassification upon Adoption [Member] | ASU 2020-06 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Ending Balance	$ 0