UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
REVENUES	$ 84,705	$ 57,623	$ 219,502	$ 165,978
COST OF REVENUES (exclusive of depreciation and amortization shown below)	51,828	39,804	142,115	116,248
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	24,442	12,656	64,810	35,464
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENT CONSIDERATION	13,404	256	17,387	(670)
DEPRECIATION AND AMORTIZATION	9,740	7,412	27,084	20,262
LOSS FROM OPERATIONS	(14,709)	(2,505)	(31,894)	(5,326)
OTHER EXPENSE
Other expense	(9,637)	(2,460)	(17,534)	(3,639)
Interest expense—net	(3,043)	(2,130)	(10,896)	(4,590)
Total other expenses—net	(12,680)	(4,590)	(28,430)	(8,229)
LOSS BEFORE EXPENSE (BENEFIT) FROM INCOME TAXES	(27,389)	(7,095)	(60,324)	(13,555)
INCOME TAXES EXPENSE (BENEFIT)	3,348	(412)	(1,563)	(1,308)
NET LOSS	(30,737)	(6,683)	(58,761)	(12,247)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	80	(20)	27	3
COMPREHENSIVE LOSS	(30,657)	(6,703)	(58,734)	(12,244)
ACCRETION OF REDEEMABLE SERIES A-1 PREFERRED STOCK	(6,542)	(5,030)	(17,601)	(14,341)
REDEEMABLE SERIES A-1 PREFERRED STOCK DEEMED DIVIDEND	(24,341)		(24,341)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(2,870)		(2,870)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (64,490)	$ (11,713)	$ (103,573)	$ (26,588)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING— BASIC AND DILUTED	21,554	8,718	13,669	8,640
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS— BASIC AND DILUTED	$ (2.99)	$ (1.34)	$ (7.58)	$ (3.08)