SEGMENT INFORMATION - Operations by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 63,593	$ 68,981	$ 169,544	$ 178,383
Total gross profit	20,945	24,877	60,745	61,881
Selling, general and administrative expenses	28,614	29,965	95,314	97,935
Operating loss	(7,669)	(5,088)	(34,569)	(36,054)
Other income/(expense)	518	20	648	(1,001)
Interest expense	(181)	(195)	(558)	(583)
Loss before income taxes	(7,332)	(5,263)	(34,479)	(37,638)
(Provision for)/benefit from income taxes	(8)	41	(133)	(6)
Net loss	(7,340)	(5,222)	(34,612)	(37,644)
Security Solutions Segment
Segment Reporting Information [Line Items]
Total revenue	32,440	34,558	90,178	89,624
Total gross profit	15,577	19,517	47,062	46,032
Secure Networks Segment
Segment Reporting Information [Line Items]
Total revenue	31,153	34,423	79,366	88,759
Total gross profit	$ 5,368	$ 5,360	$ 13,683	$ 15,849