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STOCKHOLDERS’ EQUITY - Schedule of Common Stock Reserved for Future Issuance (Details) - shares | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Class of Stock [Line Items] |  |
Total (in shares) | 45,953,012 | 43,289,438
Common stock warrants |  |
Class of Stock [Line Items] |  |
Total (in shares) | 12,517,328 | 12,517,328
Series X Convertible Preferred Stock |  |
Class of Stock [Line Items] |  |
Total (in shares) | 18,184,720 | 18,184,720
Stock options, RSUs and PRSUs issued and outstanding |  |
Class of Stock [Line Items] |  |
Total (in shares) | 10,847,996 | 9,470,178
Authorized for future stock awards |  |
Class of Stock [Line Items] |  |
Total (in shares) | 3,232,404 | 2,436,984
Awards available under the ESPP |  |
Class of Stock [Line Items] |  |
Total (in shares) | 1,170,564 | 680,228

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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