CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
REVENUES	$ 624,208	$ 544,416	$ 546,413
COST OF REVENUES (exclusive of depreciation and amortization)	383,903	351,882	369,028
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	222,861	176,295	117,658
FAIR VALUE CHANGES IN BUSINESS ACQUISITION CONTINGENCIES	84	(3,227)	24,372
DEPRECIATION AND AMORTIZATION	45,780	47,479	44,810
LOSS FROM OPERATIONS	(28,420)	(28,013)	(9,455)
OTHER EXPENSE:
Other income (expense)	4,374	3,683	(2,546)
Interest expense—net	(7,793)	(5,239)	(11,615)
Total other expenses-net	(3,419)	(1,556)	(14,161)
LOSS BEFORE (BENEFIT) EXPENSE FROM INCOME TAXES	(31,839)	(29,569)	(23,616)
INCOME TAX (BENEFIT) EXPENSE	(980)	2,250	1,709
NET LOSS	(30,859)	(31,819)	(25,325)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	(231)	(28)	(35)
COMPREHENSIVE LOSS	(31,090)	(31,847)	(25,360)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(16,400)	(16,400)	(16,400)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (47,259)	$ (48,219)	$ (41,725)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC	30,058	29,688	26,724
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED	30,058	29,688	26,724
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - BASIC	$ (1.57)	$ (1.62)	$ (1.56)
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - DILUTED	$ (1.57)	$ (1.62)	$ (1.56)