SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss), as reported	$ 1,008	$ 6,915	$ (485)	$ 39,329
Less: Distributed net income available to participating securities	0	(14)	0	(19)
Less: Undistributed net income available to participating securities	(17)	(39)	0	(287)
Numerator for basic net income (loss) per share:	991	6,862	(485)	39,023
Add: Undistributed net income allocated to participating securities	17	39	0	287
Less: Undistributed net income reallocated to participating securities	(17)	(39)	0	(283)
Numerator for diluted net income (loss) per share:	$ 991	$ 6,862	$ (485)	$ 39,027
Denominator:
Weighted average shares outstanding for basic net income (loss) per share (in shares)	14,820,881	14,632,276	14,759,062	14,589,655
Effect of dilutive securities (in shares)	0	218,890	0	210,477
Weighted average shares outstanding for diluted net income (loss) per share (in shares)	14,820,881	14,851,166	14,759,062	14,800,132
Net income (loss) per share
Basic (in dollars per share)	$ 0.07	$ 0.47	$ (0.03)	$ 2.67
Diluted (in dollars per share)	$ 0.07	$ 0.46	$ (0.03)	$ 2.64
Anti-dilutive securities (in shares)	30,087		19,394