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v3.23.2

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 07, 2023 | Jul. 20, 2023 | Jul. 13, 2023 | Apr. 13, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Feb. 13, 2023 | Dec. 31, 2022 | Jun. 16, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  | $ 9,548,000 | $ 7,456,000 | $ 20,463,000 | $ 14,260,000 |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  | 427,303,000 |  | 427,303,000 |  |  | $ 376,797,000 |
Net loss |  |  |  |  | 25,898,000 | 13,349,000 | 50,506,000 | 25,266,000 |  |  |
Net cash outflows from operations |  |  |  |  |  |  | 29,044,000 | 21,499,000 |  |  |
Cash |  |  |  |  | 7,514,000 |  | 7,514,000 |  |  | $ 7,065,000 |
Working capital deficit |  |  |  |  | $ 20,800,000 |  | $ 20,800,000 |  |  |  |
ELOC, right to sell common stock (in shares) |  |  |  |  |  |  |  |  | $ 35,000,000 |  | $ 150,000,000
Common stock, par value (in usd per share) |  |  |  |  | $ 0.0001 |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001
ELOC, ownership restriction percentage |  |  |  |  |  |  |  |  |  |  | 9.90%
ELOC, floor stock price (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 1.00
Proceeds from stock issuance |  |  |  |  |  |  | $ 15,700,000 |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  | 13,239,654 |  |  |  |
Proceeds from Term Loan |  |  |  |  |  |  | $ 14,357,000 | 19,870,000 |  |  |
Unrealized losses on Term Loan |  |  |  |  | $ 345,000 | 0 | 345,000 | 0 |  |  |
Marketable investments |  |  |  |  | $ 1,200,000 |  | $ 1,200,000 |  |  | $ 1,200,000 |
Warrants, quoted price (in usd per share) |  |  |  |  | $ 0.19 |  | $ 0.19 |  |  |  |
Warrants outstanding (in shares) |  |  |  |  | 17,916,609 |  | 17,916,609 |  |  |  |
SR&ED investment tax credit |  |  |  |  | $ 0 | 400,000 | $ 0 | 800,000 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
ELOC, right to sell common stock (in shares) |  |  | $ 35,000,000 |  |  |  |  |  |  |  |
Proceeds from stock issuance | $ 34,200,000 |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) | 16,590,877 |  |  |  |  |  |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  | 400,000 |  | 700,000 |  |  |  |
Interest expense |  |  |  |  |  | $ 300,000 |  | $ 300,000 |  |  |
Term Loan | Line of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 50,000,000.0 |  |  |  |  |  |  |
Non-dilutive financing |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |
Premium payment, percentage of amount prepaid from common stock issuance proceeds |  |  |  | 10.00% |  |  |  |  |  |  |
Unrealized losses on Term Loan |  |  |  |  | $ 300,000 |  | $ 300,000 |  |  |  |
Term Loan | Line of credit | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium payment, percentage of amount prepaid from common stock issuance proceeds |  | 10.00% |  |  |  |  |  |  |  |  |
Term Loan | Line of credit | Debt tranche one |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 15,000,000.0 |  |  |  |  |  |  |
Term Loan | Line of credit | Debt tranche two |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | 15,000,000 |  |  |  |  |  |  |
Term Loan | Line of credit | Debt tranche two | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Term Loan |  |  | $ 15,000,000 |  |  |  |  |  |  |  |
Term Loan | Line of credit | Debt tranche three |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 20,000,000.0 |  |  |  |  |  |  |

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