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STOCKHOLDERS' EQUITY - Compensation 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, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares
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 | $					$ 0.2	$ 0.2
Unrecognized compensation expense | $					$ 2.4	$ 3.0
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					1,840,336	2,293,120
Exercised (in shares) | shares					(247,670)	(1,873)
Outstanding shares at the end of the period | shares					1,592,666	2,291,247
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 | $					$ 0.1
Unrecognized compensation expense | $					$ 3.5
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					2,782,424
Outstanding shares at the end of the period | shares					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
Outstanding shares at the end of the period (in dollars per share) | $ / shares					$ 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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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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