CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Total Radnet, Inc.'s Equity	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018			48,977,485
Beginning balance, value at Dec. 31, 2018	$ 200,253	$ 127,184	$ 5	$ 242,835	$ 2,259	$ (117,915)	$ 73,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options (in shares)			10,000
Issuance of common stock upon exercise of options	50	50		50
Issuance of common stock under the equity compensation plan (in shares)			653,786
Issuance of common stock under the equity compensation plan	0
Stock-based compensation expense	4,514	4,514		4,514
Issuance of common stock for purchase of membership interest (in shares)			440,207
Issuance of common stock for purchase of membership interest in HVRA	6,000	6,000		6,000
Sale of noncontrolling interests, net of taxes	5,097	3,089		3,089			2,008
Distributions paid to noncontrolling interests	750						750
Change in cumulative foreign currency translation adjustment	(8)	(8)			(8)
Change in fair value cash flow hedge, net of taxes	(1,196)	(1,196)			(1,196)
Net income (loss)	(1,922)	(3,733)				(3,733)	1,811
Ending balance (in shares) at Mar. 31, 2019			50,081,478
Ending balance, value at Mar. 31, 2019	213,538	135,900	$ 5	256,488	1,055	(121,648)	77,638
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 cash flow hedge, net of taxes	(18,549)	(18,549)			(18,549)
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