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v3.23.3

Liquidity and Going Concern - Additional Information (Details) |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2023 | Apr. 21, 2023 | Apr. 20, 2023 | Nov. 22, 2022 | May 24, 2022 $ / shares | Mar. 29, 2020 | Mar. 28, 2020 | May 29, 2015 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | $ (3,219,000) | $ (1,482,000) | $ (4,805,000) | $ (5,219,000) | $ (5,282,000) | $ (4,116,000) | $ (9,506,000) | $ (14,617,000) |
Accumulated deficit |  |  |  |  |  |  |  |  | (476,691,000) |  |  |  |  |  | (476,691,000) |  | $ (467,185,000)
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10,970,000) | $ (10,738,000) |
Closing bid price for common stock had fallen below | $ / shares |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |
Consecutive business days |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Period for regain compliance |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |
Regain compliance expiry date |  |  |  | May 22, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split conversion ratio | 0.06 | 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split effective date | May 01, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split | one-for-fifteen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal and final payment loan amount |  |  |  |  |  |  |  | $ 17,700,000 | 4,400,000 |  |  |  |  |  | $ 4,400,000 |  |
Maturity date |  |  |  |  |  | Jun. 01, 2024 | Sep. 01, 2021 | May 01, 2021 |  |  |  |  |  |  | Jun. 01, 2024 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split conversion ratio |  |  | 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  | one-for-fifteen |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal and final payment loan amount |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  | $ 3,000,000.0 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split conversion ratio |  |  | 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  | one-for-three |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-4 + Details
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