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STOCKHOLDERS' EQUITY - Compensation Plan (Details) $ / shares in Units, $ in Millions	1 Months Ended				6 Months Ended
	Nov. 30, 2018 $ / shares	Nov. 30, 2018 $ / shares	Jan. 31, 2015 $ / shares	Jan. 31, 2015 $ / shares	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares
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 | $					$ 0.3	$ 0.3
Unrecognized compensation expense | $					$ 1.1	$ 1.7
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					1,264,410	1,379,734
Exercised (in shares) | shares					(370,959)	(54,221)
Outstanding shares at the end of the period | shares					893,451	1,325,513
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares					$ 2.63	$ 2.63
Exercised (in dollars per share) | $ / shares					2.63	2.63
Outstanding shares at the end of the period (in dollars per share) | $ / shares					$ 2.63	$ 2.63
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 | $					$ 0.3	$ 0.3
Unrecognized compensation expense | $					$ 3.6	$ 4.2
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					3,918,458	4,002,898
Exercised (in shares) | shares					(625,742)	(37,940)
Outstanding shares at the end of the period | shares					3,292,716	3,964,958
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares					$ 1.86	$ 1.86
Exercised (in dollars per share) | $ / shares					1.86	1.86
Outstanding shares at the end of the period (in dollars per share) | $ / shares					$ 1.86	$ 1.86

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Represents the percentage of title acquired by the employee in every two years on shares paid in previous two years.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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.

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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.

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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.

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