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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock Units (Details) - Restricted Stock Units $ / shares in Units, $ in Thousands			3 Months Ended			9 Months Ended
	May 17, 2017 shares	Feb. 17, 2016 item shares	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)
Directors
Number of Shares
Granted (in shares)	25,197
2015 EIP Plan
Number of Shares
Balance at the beginning of the period (in shares)						66,666
Granted (in shares)						317,595
Vested (in shares)		(2,328)				(66,666)
Balance at the end of the period (in shares)			317,595	66,666		317,595
Number of resignations from the Board of Directors | item		2
Weighted Average Fair Value
Balance at the beginning of the period (in dollars per share) | $ / shares						$ 5.10
Granted (in dollars per share) | $ / shares						11.05
Vested (in dollars per share) | $ / shares						5.10
Balance at the end of the period (in dollars per share) | $ / shares			$ 11.05	$ 5.10		$ 11.05
Weighted-average remaining contractual life						1 year 11 months 5 days
Additional disclosures
Total fair value of shares vested | $						$ 675	$ 30
Unrecognized compensation cost related to nonvested stock awards
Unrecognized compensation cost | $			$ 1,815			$ 1,815
Weighted-average period for recognition of unrecognized compensation cost						1 year 11 months 5 days
2015 EIP Plan | General and Administrative Expense.
Additional disclosures
Recognized nonvested stock amortization expense | $			$ 830		$ 86	$ 1,822	$ 320
2015 EIP Plan | Vested RSUs
Number of Shares
Number of shares vested			74,106			74,106
Weighted Average Fair Value
Vested (in dollars per share) | $ / shares						$ 11.73
2015 EIP Plan | Directors
Stock Awards
Vesting period of awards						3 years
Number of Shares
Number of common shares outstanding in respect of RSUs			21,372	3,138		21,372
2015 EIP Plan | Eugene Davis
Number of Shares
Number of common shares issued in respect of RSUs	18,234

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