EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net earnings (basic)	$ 4,634	$ 3,976	$ 8,993	$ 7,492
Net earnings (diluted)	$ 4,634	$ 3,976	$ 8,993	$ 7,492
Denominator:
Weighted-average shares outstanding (basic) (in shares)	11,327,363	10,019,049	11,193,901	9,388,998
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	112,740	87,776	115,665	60,273
Weighted-average shares outstanding (diluted) (in shares)	11,440,103	10,106,825	11,309,566	9,449,271
Net earnings per share
Basic (in USD per share)	$ 0.41	$ 0.40	$ 0.80	$ 0.80
Diluted (in USD per share)	$ 0.41	$ 0.39	$ 0.80	$ 0.79