Earnings per Common Share (EPS) - Reconciliation of the Numerator and Denominator Used in Computing Basic and Diluted Net Income Attributable to Common Stockholders Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share Reconciliation [Abstract]
Net (loss) income from continuing operations	$ (494)	$ (9,218)	$ 3,981	$ (17,807)
Net income attributable to redeemable non-controlling interests	5	14	0	28
Preferred stock dividend and gain on repurchase of preferred stock	567	(2,475)	(1,562)	(4,949)
Net income (loss) attributable to Synchronoss from continuing operations	78	(11,679)	2,419	(22,728)
Net income (loss) from discontinued operations	0	700	0	(1,642)
Net income (loss) attributable to Synchronoss	78	(10,979)	2,419	(24,370)
Net income (loss) attributable to Synchronoss from continuing operations	$ 78	$ (11,679)	$ 2,419	$ (22,728)
Denominator:
Weighted average common shares outstanding - basic (in shares)	10,042	9,685	9,942	9,669
Weighted average common shares outstanding - diluted (in shares)	10,424	9,685	10,265	9,669
Basic:
Net income (loss) from continuing operations (in dollars per share)	$ 0.01	$ (1.21)	$ 0.24	$ (2.35)
Net income (loss) from continuing operations (in dollars per share)	0	0.08	0	(0.17)
Basic (in dollars per share)	0.01	(1.13)	0.24	(2.52)
Diluted:
Net income (loss) from continuing operations (in dollars per share)	0.01	(1.21)	0.24	(2.35)
Net income (loss) from continuing operations (in dollars per share)	0	0.08	0	(0.17)
Diluted (in dollars per share)	$ 0.01	$ (1.13)	$ 0.24	$ (2.52)
Performance-based cash units
Denominator:
Shares from assumed conversion of PBCU and options and unvested restricted shares (in shares)	300	0	195	0
Options and unvested restricted shares
Denominator:
Shares from assumed conversion of PBCU and options and unvested restricted shares (in shares)	82	0	128	0