Balance Sheet Components - Additional Information (Details) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
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| Depreciation and amortization expense | $ 20,000 | $ 17,000 | $ 59,000 | $ 46,000 | |
| Property and equipment, gross | 1,107,000 | 1,107,000 | $ 1,021,000 | ||
| Accumulated Depreciation | 938,000 | 938,000 | $ 879,000 | ||
| Capital lease | |||||
| Property and equipment, gross | 72,000 | 72,000 | |||
| Accumulated Depreciation | $ 26,000 | $ 26,000 | |||
| X | ||||||||||
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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