Earnings (Loss) Per Share - Schedule of Earnings (Loss) Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 09, 2021
Numerator:
Net income (loss) attributable to UpHealth, Inc. | $	$ 32,592	$ (521)	$ (3,141)	$ (1,060)
Denominator:
Weighted average shares outstanding (in shares)	117,628	50,050	95,194	50,050
Diluted effect of convertible notes (in shares)	0	0	0	0
Diluted effect of forward share purchase agreement (in shares)	0	0	0	0
Weighted average shares outstanding assuming dilution (in shares)	118,073	50,050	95,194	50,050
Net income (loss) per share attributable to UpHealth, Inc.:
Basic (in dollars per share) | $ / shares	$ 0.28	$ (0.01)	$ (0.03)	$ (0.02)
Diluted (in dollars per share) | $ / shares	$ 0.28	$ (0.01)	$ (0.03)	$ (0.02)
Exchange ratio					10.28
Stock awards
Denominator:
Dilutive effect of share-based payment arrangements (in shares)	270	0	0	0
Restricted stock units (RSUs)
Denominator:
Dilutive effect of share-based payment arrangements (in shares)	175	0	0	0