Net Income (Loss) Per Share - Basic and Diluted Net Loss Per Share to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to TOI	$ (5,453)	$ 19,286	$ 3,205	$ (996)	$ 13,833	$ 2,209
Less: Deemed dividend	64		0		64	0
Net income (loss) attributable to TOI available for distribution	(5,517)		3,205		13,769	2,209
Net income (loss) attributable to participating securities, basic	(1,013)		0		2,521	0
Net income (loss) attributable to common stockholders, basic	$ (4,504)		$ 3,205		$ 11,248	$ 2,209
Weighted average common shares outstanding, basic (in shares)	72,996,836		66,021,829		73,123,895	64,446,377
Net income (loss) per share attributable to common stockholders, basic (in usd per share)	$ (0.06)		$ 0.05		$ 0.15	$ 0.03
Net income (loss) attributable to TOI available for distribution	$ (5,517)		$ 3,205		$ 13,769	$ 2,209
Less: Net income attributable to participating securities, diluted	(1,013)		0		2,441	0
Net income (loss) attributable to common stockholders, diluted	$ (4,504)		$ 3,205		$ 11,328	$ 2,209
Weighted average shares outstanding, diluted (in shares)	72,996,836		66,021,829		76,106,201	64,446,377
Net income (loss) per share attributable to common stockholders, diluted (in usd per share)	$ (0.06)		$ 0.05		$ 0.15	$ 0.03