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STOCKHOLDERS' EQUITY - Employee Stock Purchase Plan (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Nov. 30, 2018 $ / shares | Nov. 30, 2018 $ / shares | Jan. 31, 2015 $ / shares | Jan. 31, 2015 $ / shares | Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) $ / shares shares
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  | $ 2.63 | $ 2.63
Exercised (in dollars per share) |  |  |  |  | 2.63 | 2.63
Forfeited (in dollars per share) |  |  |  |  | $ 2.63 |
Outstanding shares at the end of the period (in dollars per share) |  |  |  |  |  | $ 2.63
Employee Stock Purchase 2015 Plan |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  |  | $ 38.44 | $ 2.63 |  |
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 | $ |  |  |  |  | $ 0.6 | $ 1.2
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 867,234 | 1,264,410
Exercised (in shares) | shares |  |  |  |  | (16,394) | (293,041)
Outstanding shares at the end of the period | shares |  |  |  |  | 850,840 | 971,369
Employee Stock Purchase 2018 Plan |  |  |  |  |  |
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 | $ |  |  |  |  | $ 2.9 | $ 3.6
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 3,173,924 | 3,918,458
Exercised (in shares) | shares |  |  |  |  | (115,903) | (592,768)
Outstanding shares at the end of the period | shares |  |  |  |  | 3,058,021 | 3,325,690
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  | $ 1.86 | $ 1.86
Exercised (in dollars per share) |  |  |  |  | 1.86 |
Outstanding shares at the end of the period (in dollars per share) |  |  |  |  | $ 1.86 | $ 1.86

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- Definition Represents the percentage of title acquired by the employee in every two years on shares paid in previous two years. + References No definition available. + Details
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- Definition Represents the purchase price of shares for the initial subscription as a part of share based compensation award plan. + References No definition available. + Details
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- Definition Represents the ratio of bonus granted to the participant upon meeting the eligibility period of the share based compensation plan. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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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- 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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