UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
REVENUES	$ 159,101	$ 139,910	$ 290,529	$ 274,590
COST OF REVENUES (exclusive of depreciation and amortization shown below)	98,196	90,429	179,829	178,815
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	55,247	46,456	104,860	88,263
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENCIES	353	(3,510)	(45)	(3,531)
DEPRECIATION AND AMORTIZATION	11,398	12,280	21,953	24,424
LOSS FROM OPERATIONS	(6,093)	(5,745)	(16,068)	(13,381)
OTHER (EXPENSE) INCOME
Other income (expense)-net	947	343	(889)	2,804
Interest expense—net	(1,877)	(1,518)	(3,418)	(2,610)
Total other (expense) income - net	(930)	(1,175)	(4,307)	194
LOSS BEFORE EXPENSE FROM INCOME TAXES	(7,023)	(6,920)	(20,375)	(13,187)
INCOME TAX EXPENSE	151	831	1,518	2,100
NET LOSS	(7,174)	(7,751)	(21,893)	(15,287)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	(118)	(84)	(106)	(3)
COMPREHENSIVE LOSS	(7,292)	(7,835)	(21,999)	(15,290)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(4,100)	(4,100)	(8,200)	(8,200)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (11,274)	$ (11,851)	$ (30,093)	$ (23,487)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC	30,047	29,678	29,952	29,670
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED	30,047	29,678	29,952	29,670
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - BASIC	$ (0.38)	$ (0.4)	$ (1)	$ (0.79)
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - DILUTED	$ (0.38)	$ (0.4)	$ (1)	$ (0.79)