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STOCK-BASED COMPENSATION, RSUs (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($) Goals $ / shares shares | Mar. 31, 2021 shares
RSU [Member] |  |
Outstanding Restricted Stock Units [Roll Forward] |  |
Outstanding, Beginning balance (in shares) | 240,000 |
Granted (in shares) | 1,101,000 | 0
Released (in shares) | (9,000) |
Cancelled (in shares) | (9,000) |
Outstanding, Ending balance (in shares) | 1,323,000 | 0
Balance expected to vest (in shares) | 772,000 |
Weighted Average Fair Value Per Share [Abstract] |  |
Weighted Average Fair Value Per Share, Beginning balance (in dollars per share) | $ / shares | $ 13.80 |
Granted (in dollars per share) | $ / shares | 1.93 |
Released (in dollars per share) | $ / shares | 4.21 |
Cancelled (in dollars per share) | $ / shares | 4.21 |
Weighted Average Fair Value Per Share, Ending balance (in dollars per share) | $ / shares | $ 4.05 |
Number of stock units awards outstanding (in shares) | 1,323,000 | 0
Unamortized stock-based compensation expense | $ | $ 3.6 |
Weighted average remaining requisite service period | 2 years 7 months 2 days |
2022 PSUs [Member] |  |
Weighted Average Fair Value Per Share [Abstract] |  |
Number of performance goals are subject to achieve | Goals | 4 |
Restricted stock units vesting period | 3 years |
2022 PSUs [Member] | Employees [Member] |  |
Outstanding Restricted Stock Units [Roll Forward] |  |
Granted (in shares) | 1,101,000 |
2022 PSUs [Member] | Dr. Federoff [Member] |  |
Outstanding Restricted Stock Units [Roll Forward] |  |
Granted (in shares) | 414,000 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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