CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
REVENUES	$ 546,413	$ 328,243	$ 233,854
COST OF REVENUES (exclusive of depreciation and amortization shown below)	369,028	215,492	163,983
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	117,658	85,546	49,719
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENT CONSIDERATION	24,372	12,942	1,392
DEPRECIATION AND AMORTIZATION	44,810	37,274	27,705
INCOME (LOSS) FROM OPERATIONS	(9,455)	(23,011)	(8,945)
OTHER EXPENSE:
Other expense	(2,546)	(20,268)	(10,978)
Interest expense—net	(11,615)	(13,819)	(6,755)
Total other expenses—net	(14,161)	(34,087)	(17,733)
LOSS BEFORE EXPENSE (BENEFIT) FROM INCOME TAXES	(23,616)	(57,098)	(26,678)
INCOME TAXES EXPENSE (BENEFIT)	1,709	851	(3,121)
NET INCOME (LOSS)	(25,325)	(57,949)	(23,557)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	(35)	111	(40)
COMPREHENSIVE LOSS	(25,360)	(57,838)	(23,597)
ACCRETION OF REDEEMABLE SERIES A- 1 PREFERRED STOCK		(17,601)	(19,616)
REDEEMABLE SERIES A-1 PREFERRED STOCK DEEMED DIVIDEND		(24,341)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(16,400)	(6,970)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (41,725)	$ (106,861)	$ (43,173)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING—BASIC AND DILUTED	26,724	16,479	8,789
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS—BASIC AND DILUTED	$ (1.56)	$ (6.48)	$ (4.91)