UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
REVENUES	$ 130,312	$ 132,578	$ 404,902	$ 402,619
COST OF REVENUES (exclusive of depreciation and amortization shown below)	82,234	85,242	261,049	272,662
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	42,857	30,499	131,120	82,865
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENCIES	59	0	(3,472)	24,035
DEPRECIATION AND AMORTIZATION	11,504	11,471	35,928	33,145
(LOSS) INCOME FROM OPERATIONS	(6,342)	5,366	(19,723)	(10,088)
OTHER INCOME (EXPENSE)
Other income (expense)	1,814	(516)	4,618	(1,909)
Interest expense—net	(1,400)	(1,722)	(4,010)	(11,208)
Total other income (expense) - net	414	(2,238)	608	(13,117)
(LOSS) INCOME BEFORE (BENEFIT) EXPENSE FROM INCOME TAXES	(5,928)	3,128	(19,115)	(23,205)
INCOME TAX (BENEFIT) EXPENSE	(208)	902	1,892	648
NET (LOSS) INCOME	(5,720)	2,226	(21,007)	(23,853)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	20	(74)	17	(17)
COMPREHENSIVE (LOSS) INCOME	(5,700)	2,152	(20,990)	(23,870)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(4,100)	(4,100)	(12,300)	(12,300)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (9,820)	$ (1,874)	$ (33,307)	$ (36,153)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC	29,691	26,220	29,677	25,798
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED	29,691	26,220	29,677	25,798
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - BASIC	$ (0.33)	$ (0.07)	$ (1.12)	$ (1.40)
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - DILUTED	$ (0.33)	$ (0.07)	$ (1.12)	$ (1.40)