UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
REVENUES	$ 134,680	$ 133,817
COST OF REVENUES (exclusive of depreciation and amortization shown below)	88,386	95,316
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	41,807	25,000
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENT CONSIDERATION	(21)	11,064
DEPRECIATION AND AMORTIZATION	12,144	11,796
LOSS FROM OPERATIONS	(7,636)	(9,359)
OTHER INCOME (EXPENSE)
Other income (expense)	2,461	(882)
Interest expense—net	(1,092)	(2,688)
Total other income (expense)- net	1,369	(3,570)
LOSS BEFORE EXPENSE FROM INCOME TAXES	(6,267)	(12,929)
INCOME TAX EXPENSE	1,269	2
NET LOSS	(7,536)	(12,931)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	81	29
COMPREHENSIVE LOSS	(7,455)	(12,902)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(4,100)	(4,100)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (11,636)	$ (17,031)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING— BASIC AND DILUTED	29,662	25,117
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - BASIC AND DILUTED	$ (0.39)	$ (0.68)