UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
REVENUES	$ 167,937	$ 130,312	$ 458,466	$ 404,902
COST OF REVENUES (exclusive of depreciation and amortization shown below)	102,155	82,234	281,984	261,049
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	56,901	42,857	161,761	131,120
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENCIES	459	59	414	(3,472)
DEPRECIATION AND AMORTIZATION	11,863	11,504	33,816	35,928
LOSS FROM OPERATIONS	(3,441)	(6,342)	(19,509)	(19,723)
OTHER (EXPENSE) INCOME
Other (expense) income-net	(671)	1,814	(1,560)	4,618
Interest expense—net	(2,089)	(1,400)	(5,507)	(4,010)
Total other (expense) income - net	(2,760)	414	(7,067)	608
LOSS BEFORE EXPENSE (BENEFIT) FROM INCOME TAXES	(6,201)	(5,928)	(26,576)	(19,115)
INCOME TAX EXPENSE (BENEFIT)	1,324	(208)	2,842	1,892
NET LOSS	(7,525)	(5,720)	(29,418)	(21,007)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	(198)	20	(304)	17
COMPREHENSIVE LOSS	(7,723)	(5,700)	(29,722)	(20,990)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(4,100)	(4,100)	(12,300)	(12,300)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (11,625)	$ (9,820)	$ (41,718)	$ (33,307)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC	30,143	29,691	30,016	29,677
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED	30,143	29,691	30,016	29,677
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - BASIC	$ (0.39)	$ (0.33)	$ (1.39)	$ (1.12)
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - DILUTED	$ (0.39)	$ (0.33)	$ (1.39)	$ (1.12)