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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (10,358)	$ (103,467)	$ (226,992)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	2,128	(1,768)	(6,152)
Unrealized gain (loss) on available for sale securities	751	(710)	(37)
Net income (loss) on inter-company foreign currency transactions	2,169	(400)	(821)
Total other comprehensive income (loss)	5,048	(2,878)	(7,010)
Comprehensive loss	(5,310)	(106,345)	(234,002)
Comprehensive (loss) income attributable to redeemable noncontrolling interests	(344)	(1,126)	8,837
Comprehensive loss attributable to Synchronoss	$ (5,654)	$ (107,471)	$ (225,165)

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