GOODWILL - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Balance at beginning of period	$ 243,674	$ 239,780
Foreign currency translation adjustment	(3,461)	3,894
Balance at end of period	240,213	243,674
Video
Goodwill [Roll Forward]
Balance at beginning of period	182,855	178,982
Foreign currency translation adjustment	(3,457)	3,873
Balance at end of period	179,398	182,855
Cable Access
Goodwill [Roll Forward]
Balance at beginning of period	60,819	60,798
Foreign currency translation adjustment	(4)	21
Balance at end of period	$ 60,815	$ 60,819