STOCK-BASED COMPENSATION - 2015 EIP Stock Options and Other (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		9 Months Ended
	Mar. 04, 2019	Feb. 27, 2018	Mar. 23, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Mar. 22, 2017	Jun. 26, 2015
Nonemployee Directors
Additional disclosures
Maximum annual limit for grants (in shares)			500,000
Other Individuals
Additional disclosures
Maximum annual limit for grants (in shares)			1,000,000
2015 EIP Plan
Stock options
Aggregate number of shares of common stock available for awards			2,750,000						400,000	400,000
2015 EIP Plan | Stock Options
Stock options
Vesting percentage of awards	33.33%	33.33%
Vesting period	3 years	3 years
Unrecognized compensation cost
Unamortized compensation cost				$ 798		$ 798
Future amortization of stock based compensation
Remainder of 2019				208		208
2020				431		431
2021				142		142
2022				$ 17		$ 17
Number of Options
Outstanding at beginning of period (in shares)						166,942
Granted (in shares)	240,540	122,608				240,540
Exercisable (in shares)						(40,869)
Outstanding at end of period (in shares)				366,613		366,613
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)						$ 13.01
Granted (in dollars per share)	$ 8.39	$ 13.69				8.39
Exercisable (in dollars per share)						13.69
Outstanding at end of period (in dollars per share)				$ 9.90		9.90
Weighted Average Fair Value
Outstanding at beginning of period (in dollars per share)						7.25
Granted (in dollars per share)	$ 3.76	$ 7.55				3.76
Exercisable (in dollars per share)						7.55
Outstanding at end of period (in dollars per share)				4.93		4.93
Weighted Average Exercise Price Of Outstanding Options				$ 10.43		$ 10.43
Options Outstanding, Weighted Average Remaining Contractual Life						4 years 11 months 19 days
Options Exercisable, Number of options				129,535		129,535
Options Exercisable, Weighted Average Exercise Price				$ 11.94		$ 11.94
Options Exercisable, Weighted Average Remaining Contractual Life						2 years 10 months 13 days
Aggregate fair value	$ 904	$ 926
Stock options outstanding - nonvested and exercisable				496,148		496,148		255,608
Assumptions and Methodology
Weighted average volatility rate (as a percent)	55.23%	71.94%
Risk-free interest rate ( as a percent)	2.49%	2.53%
Dividend rate ( as a percent)	0.00%	0.00%
Expected life (in years)	4 years	4 years
2015 EIP Plan | Stock Options | General and Administrative Expense
Stock options
Amortization expense				$ 232	$ 216	$ 642	$ 553
2015 EIP Plan | Stock Options | John C. Wobensmith
Stock options
Vesting percentage of awards			33.33%
Vesting period			3 years
Number of Options
Granted (in shares)			133,000
Weighted Average Exercise Price
Granted (in dollars per share)			$ 11.13
Weighted Average Fair Value
Granted (in dollars per share)			$ 6.41
Aggregate fair value			$ 853
Assumptions and Methodology
Weighted average volatility rate (as a percent)			79.80%
Risk-free interest rate ( as a percent)			1.68%
Dividend rate ( as a percent)			0.00%
Expected life (in years)			3 years 9 months 11 days