STOCKHOLDERS' EQUITY - Employee Stock Purchase 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, 2022 USD ($) $ / shares shares	Jun. 30, 2021 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 | $					$ 0.5	$ 1.1
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					867,234	1,264,410
Exercised (in shares) | shares					(16,394)	(370,959)
Outstanding shares at the end of the period | shares					850,840	893,451
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 | $					$ 3.0	$ 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					(160,236)	(625,742)
Outstanding shares at the end of the period | shares					3,013,688	3,292,716
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