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, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares
Information related to compensation cost
Stock based compensation expense | $						$ 0.2
Unrecognized compensation expense | $						3.4
Employee Stock Purchase 2015 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)			$ 2.63	$ 38.44
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 | $					$ 1.7	$ 2.3
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					1,379,734	1,840,336
Exercised (in shares) | shares					(54,221)	(425,076)
Outstanding shares at the end of the period | shares					1,325,513	1,415,260
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)	$ 1.86	$ 37.89
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
Unrecognized compensation expense | $					$ 4.2
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					4,002,898	2,782,424
Exercised (in shares) | shares					(37,940)
Outstanding shares at the end of the period | shares					3,964,958	2,782,424
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
Outstanding shares at the end of the period (in dollars per share) | $ / shares					$ 1.86	$ 1.86