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STOCKHOLDERS' EQUITY - Employee Stock Purchase Plan (Details) - Employee Stock Purchase 2018 Plan $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2018 $ / shares | Nov. 30, 2018 $ / shares | Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2023 $ / shares shares
Information related to compensation cost |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) | $ 37.89 | $ 1.86 |  |  |
Percentage of title acquired by employee in every two years on shares paid in previous two years |  |  | 50.00% |  |
Period of plan |  |  | 8 years |  |
Ratio of bonus shares granted to participant |  |  | 0.1 |  |
Stock based compensation expense | $ |  |  | $ 0.2 | $ 0.2 |
Unrecognized compensation expense | $ |  |  | $ 1.5 | $ 2.2 |
Stock award activity, Shares |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  | 1,962,936 | 2,754,506 | 2,754,506
Exercised (in shares) | shares |  |  | (22,216) | (624,026) |
Outstanding shares at the end of the period | shares |  |  | 1,940,720 | 2,130,480 | 1,962,936
Unit Weighted Average Grant Date Fair Value |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares |  |  | $ 1.86 | $ 1.86 | $ 1.86
Exercised (in dollars per share) | $ / shares |  |  | 1.86 |  |
Outstanding shares at the end of the period (in dollars per share) | $ / shares |  |  | $ 1.86 | $ 1.86 | $ 1.86

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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