CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	DeepHealth, Inc.	Total Radnet, Inc.'s Equity	Common Stock	Common Stock DeepHealth, Inc.	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2019				50,314,328
Beginning balance, value at Dec. 31, 2019	$ 233,139		$ 151,685	$ 5		$ 262,865	$ (8,026)	$ (103,159)	$ 81,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the equity compensation plan (in shares)				380,047
Issuance of common stock under the equity compensation plan	0
Stock-based compensation expense	6,596		6,596			6,596
Change in cumulative foreign currency translation adjustment	1		1				1
Change in fair value of cash flow hedge, net of taxes	(18,549)		(18,549)				(18,549)
Amount of loss reclassified from accumulated OCI into income (prior period effective portion)	0
Net income (loss)	(13,998)		(16,358)					(16,358)	2,360
Ending balance (in shares) at Mar. 31, 2020				50,694,375
Ending balance, value at Mar. 31, 2020	207,189		123,375	$ 5		269,461	(26,574)	(119,517)	83,814
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
Issuance of common stock under the equity compensation plan	0	$ 0
Stock-based compensation expense	8,248		8,248			8,248
Purchase of noncontrolling interests			(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, net of taxes	0
Amount of loss reclassified from accumulated OCI into income (prior period effective portion)	925		925				925
Net income (loss)	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