STOCKHOLDERS' EQUITY AND CLASS A PREFERRED STOCK - 2015 Stock Plan (Details) - Stock Options - USD ($) |
12 Months Ended | ||
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Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2015 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Number of shares available for issuance | 1,020,661 | ||
| Share-based Payment Arrangement, Expense | $ 51,000 | $ 153,000 | |
| Stock Plan 2015 [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Number of shares authorized for grant | 3,000,000 | ||
| Number of additional shares authorized for grant | 1,642,857 | ||
| Share-based Payment Arrangement, Expense | $ 2,500,000 | $ 200,000 | |
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. No definition available.
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- Definition Number of shares authorized for issuance under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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