CONDENSED CONSOLIDATED STATEMENT 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
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 under the equity compensation plan (in shares)			699,825	494
Stock-based compensation expense	8,248	8,248			8,248
Purchase of noncontorlling interests	(4)	(4)			(4)
Contribution from noncontrolling partner	123							123
Change in cumulative foreign currency translation adjustment	(12)	(12)				(12)
Change in fair value of cash flow hedge from prior periods reclassified to earnings, net of taxes	925	925				925
Net income	13,775	9,458					9,458	4,317
Ending balance (in shares) at Mar. 31, 2021			52,340,856
Ending balance, value at Mar. 31, 2021	281,358	184,358	$ 5		316,032	(23,138)	(108,541)	97,000
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
Ending balance (in shares) at Dec. 31, 2021			53,548,227
Ending 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)			530,188	13,119
Stock-based compensation expense	10,801	10,801			10,801
Issuance of common stock for sale of unregistered securities for acquisition (in shares)			2,106,292
Issuance of common stock in connection with acquisitions	56,470	56,470			56,470
Change in cumulative foreign currency translation adjustment	(1,264)	(1,264)				(1,264)
Change in fair value of cash flow hedge from prior periods reclassified to earnings, net of taxes	923	923				923
Other	0					1	(1)
Net income	8,363	3,013					3,013	5,350
Ending balance (in shares) at Mar. 31, 2022			56,197,826
Ending balance, value at Mar. 31, 2022	$ 421,450	$ 298,847	$ 5		$ 409,863	$ (20,761)	$ (90,260)	$ 122,603