CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Total Radnet, Inc.'s Equity	Common Stock	Common Stock DeepHealth, Inc.	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interests	Total Radnet, Inc.'s Equity
Beginning balance (in shares) at Dec. 31, 2020			51,640,537
Beginning balance, value at Dec. 31, 2020	$ 258,303	$ 165,743	$ 5		$ 307,788	$ (24,051)	$ (117,999)	$ 92,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options (in shares)			2,500
Issuance of common stock upon exercise of options	26	26			26
Issuance of common stock under the equity compensation plan (in shares)			1,127,996	466,490
Stock-based compensation expense	21,608	21,608			21,608
Issuance of common stock for sale of unregistered securities for acquisition (in shares)			67,658
Issuance of common stock for sale of unregistered securities for acquisition	2,025	2,025			2,025
Purchase of noncontrolling interests	(4)	(4)			(4)
Contribution from noncontrolling partner	123							123
Adjustment for shares returned/forfeited (in shares)			(3,365)
Adjustment for shares returned/forfeited	(42)				(42)				$ (42)
Sale of economic interests in majority owned subsidiary, net of taxes	11,602				4,198			7,404	4,198
Change in cumulative foreign currency translation adjustment	(32)	(32)				(32)
Change in fair value of cash flow hedge from prior periods reclassified to earnings, net of taxes	2,765	2,765				2,765
Other	0					1	(1)
Net income	43,005	28,550					28,550	14,455
Ending balance (in shares) at Sep. 30, 2021			53,301,816
Ending balance, value at Sep. 30, 2021	339,379	224,837	$ 5		335,599	(21,317)	(89,450)	114,542
Beginning balance (in shares) at Jun. 30, 2021			52,678,030
Beginning balance, value at Jun. 30, 2021	299,279	197,064	$ 5		324,954	(22,227)	(105,668)	102,215
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the equity compensation plan (in shares)			94,638	464,855
Stock-based compensation expense	4,463	4,463			4,463
Issuance of common stock for sale of unregistered securities for acquisition (in shares)			67,658
Issuance of common stock for sale of unregistered securities for acquisition	2,025	2,025			2,025
Forfeiture of restricted stock (in shares)			(3,365)
Forfeiture of restricted stock	(42)				(42)				(42)
Sale of economic interests in majority owned subsidiary, net of taxes	11,602				4,198			7,404	$ 4,198
Change in cumulative foreign currency translation adjustment	(11)	(11)				(11)
Change in fair value of cash flow hedge from prior periods reclassified to earnings, net of taxes	920	920				920
Other	(1)	0			1	1	(2)	(1)
Net income	21,144	16,220					16,220	4,924
Ending balance (in shares) at Sep. 30, 2021			53,301,816
Ending balance, value at Sep. 30, 2021	$ 339,379	224,837	$ 5		335,599	(21,317)	(89,450)	114,542
Beginning balance (in shares) at Dec. 31, 2021	53,548,227		53,548,227
Beginning balance, value at Dec. 31, 2021	$ 346,157	228,904	$ 5		342,592	(20,421)	(93,272)	117,253
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the equity compensation plan (in shares)			685,577	973,144
Stock-based compensation expense	18,856	18,856			18,856
Issuance of common stock for sale of unregistered securities for acquisition (in shares)			2,106,292
Issuance of common stock for sale of unregistered securities for acquisition	56,470	56,470			56,470
Contribution from noncontrolling partner	11,077							11,077
Adjustment for shares returned/forfeited (in shares)			(22,484)
Adjustment for shares returned/forfeited	(45)	(45)			(45)
Sale of economic interests in majority owned subsidiary, net of taxes	6,498	6,498			6,498			0
Change in cumulative foreign currency translation adjustment	(12,031)	(12,031)				(12,031)
Change in fair value of cash flow hedge from prior periods reclassified to earnings, net of taxes	2,771	2,771				2,771
Other	(3)	(2)			(2)	1	(1)	(1)
Net income	$ 28,640	11,585					11,585	17,055
Ending balance (in shares) at Sep. 30, 2022	57,290,756		57,290,756
Ending balance, value at Sep. 30, 2022	$ 458,390	313,006	$ 5		424,369	(29,680)	(81,688)	145,384
Beginning balance (in shares) at Jun. 30, 2022			57,303,565
Beginning balance, value at Jun. 30, 2022	451,385	312,183	$ 5		419,136	(24,603)	(82,355)	139,202
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the equity compensation plan (in shares)			2,500	7,175
Stock-based compensation expense	3,362	3,362			3,362
Contribution from noncontrolling partner	404							404
Adjustment for shares returned/forfeited (in shares)			(22,484)
Adjustment for shares returned/forfeited	(45)	(45)			(45)
Sale of economic interests in majority owned subsidiary, net of taxes	1,916	1,916			1,916
Change in cumulative foreign currency translation adjustment	(6,000)	(6,000)				(6,000)
Change in fair value of cash flow hedge from prior periods reclassified to earnings, net of taxes	924	924				924
Other	(3)	(2)				(1)	(1)	(1)
Net income	$ 6,447	668					668	5,779
Ending balance (in shares) at Sep. 30, 2022	57,290,756		57,290,756
Ending balance, value at Sep. 30, 2022	$ 458,390	$ 313,006	$ 5		$ 424,369	$ (29,680)	$ (81,688)	$ 145,384