UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
REVENUES	$ 136,224	$ 73,766	$ 270,041	$ 134,797
COST OF REVENUES (exclusive of depreciation and amortization shown below)	92,104	45,889	187,420	90,287
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	27,366	19,318	52,366	39,837
INITIAL PUBLIC OFFERING EXPENSE				531
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENT CONSIDERATION	12,971	3,983	24,035	3,983
DEPRECIATION AND AMORTIZATION	10,905	9,784	21,674	17,344
(LOSS) FROM OPERATIONS	(7,122)	(5,208)	(15,454)	(17,185)
OTHER (EXPENSE) INCOME
Other (expense) income	(819)	21,933	(1,393)	(7,897)
Interest expense—net	(6,798)	(5,260)	(9,486)	(7,853)
Total other (expenses) income—net	(7,617)	16,673	(10,879)	(15,750)
LOSS BEFORE (BENEFIT) EXPENSE FROM INCOME TAXES	(14,739)	11,465	(26,333)	(32,935)
INCOME TAXES BENEFIT	(256)	(1,759)	(254)	(4,911)
NET (LOSS) INCOME	(14,483)	13,224	(26,079)	(28,024)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	28	(90)	57	(53)
COMPREHENSIVE (LOSS) INCOME	(14,455)	13,134	(26,022)	(28,077)
ACCRETION OF REDEEMABLE SERIES A-1 PREFERRED STOCK		(5,644)		(11,059)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(4,100)		(8,200)
NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (18,583)	$ 7,580	$ (34,279)	$ (39,083)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING— BASIC	26,056	10,649	25,586	9,718
NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS— BASIC	$ (0.71)	$ 0.71	$ (1.34)	$ (4.02)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING— DILUTED	26,056	19,139	25,586	9,718
NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS— DILUTED	$ (0.71)	$ 0.40	$ (1.34)	$ (4.02)