STOCK-BASED COMPENSATION - Non-Employee Director Stock Compensation (Details) - Share-based Payment Arrangement, Nonemployee - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based compensation
Annual award	$ 20
Number of shares awarded calculated based on the number of days of average price of the Company’s common stock	20 days
Number of business days based on which number of days of average price of the Company’s common stock, the number of shares awarded are calculated	2 days
Expense recognized		$ 532	$ 239	$ 103
Expense recognized (in shares)		9,004	3,822	1,833
Annual award received	$ 174