STOCKHOLDERS’ EQUITY - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ 295,913	$ 258,302	$ 252,446	$ 228,250
Total accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	(3,272)	5,856	$ (3,065)	$ (1,216)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	(3,120)	5,774
Actuarial gain (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ (152)	$ 82