CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS EQUITY (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Total Merge Shareholders' Equity [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2012	$ 931	$ 577,774	$ (504,195)	$ 1,567	$ 77,011	$ 450	$ 77,461
Balance, common stock subscribed at Dec. 31, 2012	934
Balance, common stock issued (in shares) at Dec. 31, 2012	93,137,737						93,137,737
Balance, common stock subscribed (in shares) at Dec. 31, 2012	158,395						158,395
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued under ESPP, common stock subscribed	(20)
Stock issued under ESPP, common stock subscribed (in shares)	(9,054)
Stock issued under ESPP	1	84	0	0	65	0	65
Stock issued under ESPP, common stock issued (in shares)	36,103
Exercise of stock options	2	329	0	0	331	0	331
Exercise of stock options, common stock issued (in shares)	225,000
Share-based compensation expense	0	1,643	0	0	1,643	0	1,643
Net loss	0	0	(6,475)	0	(6,475)	(18)	(6,493)
Other comprehensive income	0	0	0	(29)	(29)	0	(29)
Balance at Mar. 31, 2013	934	579,830	(510,670)	1,538	72,546	432	72,978
Balance, common stock subscribed at Mar. 31, 2013	$ 914
Balance, common stock issued (in shares) at Mar. 31, 2013	93,398,840						93,398,840
Balance, common stock subscribed (in shares) at Mar. 31, 2013	149,341						149,341