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v3.22.4

Going Concern - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 03, 2022 | Feb. 28, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Net loss |  |  | $ (16,891,000) | $ (29,199,000) | $ (44,836,000) |
Net cash used by operating activities |  |  | (19,364,000) | (18,811,000) | (43,672,000) |
Cash, cash equivalents, and restricted cash |  |  | 3,526,000 | 14,421,000 | $ 18,289,000 | $ 60,038,000
Current liabilities |  |  | 1,662,000 | $ 4,854,000 |  |
Common stock, issued and sold |  | 3,880,000 |  |  |  |
Issuance of common stock |  | $ 10,000,000 |  |  |  |
After deduction of underwriting discounts and estimated other offering expenses |  | $ 900,000 |  |  |  |
ATM Facility [Member] |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Common stock, issued and sold | 2,000,000 |  |  |  |  |
After deduction of underwriting discounts and estimated other offering expenses | $ 100,000 |  |  |  |  |
Common stock shares subscribed but not issued | 15,661,000 |  |  |  |  |
Shelf Registration Statement [Member] | ATM Facility [Member] |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Minimum public float |  |  | 75,000,000 |  |  |
Maximum [Member] | ATM Facility [Member] |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Common stock shares subscribed but not issued | 15,661,000 |  |  |  |  |
Pre-funded Warrants [Member] | Maximum [Member] |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Warrants issued (in shares) |  | 3,880,000 |  |  |  |
Common Warrants [Member] | Maximum [Member] |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Warrants issued (in shares) |  | 7,760,000 |  |  |  |
Equipment [Member] |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Restricted cash |  |  | $ 100,000 |  |  |

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