Quarterly Results (unaudited) (Details) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Selected Quarterly Financial Information [Abstract]
Net sales	$ 64,646,000	$ 60,394,000	$ 62,886,000	$ 60,978,000	$ 64,087,000	$ 60,077,000	$ 55,592,000	$ 52,672,000	$ 46,170,000	$ 45,189,000	$ 29,003,000	$ 19,970,000	$ 248,904,000	$ 232,428,000	$ 140,332,000
Gross margin	33,728,000	35,540,000	35,590,000	35,995,000	40,216,000	36,128,000	36,861,000	30,569,000	24,775,000	24,451,000	12,989,000	13,554,000	140,853,000	143,774,000	75,769,000
Income (loss) before income taxes	(16,571,000)	(2,142,000)	(3,758,000)	(2,258,000)	(208,000)	(1,255,000)	341,000	(744,000)	(3,696,000)	(3,459,000)	(14,903,000)	(3,104,000)	(24,729,000)	(1,866,000)	(25,162,000)
Net income (loss)	(17,252,000)	(3,826,000)	(5,879,000)	(1,863,000)	(1,244,000)	(1,013,000)	(1,685,000)	(1,589,000)	10,043,000	(3,446,000)	(14,961,000)	(3,152,000)	(28,820,000)	(5,531,000)	(11,516,000)
Net income (loss) attributable to Merge	(17,264,000)	(3,814,000)	(5,882,000)	(1,842,000)	(1,252,000)	(995,000)	(1,685,000)	(1,589,000)	10,043,000	(3,446,000)	(15,009,000)	(3,104,000)	(28,802,000)	(5,521,000)	(11,516,000)
Net income (loss) available to common shareholders	(17,264,000)	(3,814,000)	(5,882,000)	(1,842,000)	(1,252,000)	(995,000)	(3,272,000)	(3,155,000)	8,477,000	(5,012,000)	(30,905,000)	(3,152,000)	(28,802,000)	(8,674,000)	(30,592,000)
Basic and diluted income (loss) per share (in dollars per share)	$ (0.19)	$ (0.04)	$ (0.06)	$ (0.02)	$ (0.01)	$ (0.01)	$ (0.04)	$ (0.04)	$ 0.10	$ (0.06)	$ (0.39)	$ (0.04)
Impairment of finite-lived intangible assets	3,872,000
Write-off of acquired intangibles excluding goodwill	1,308,000
Uncollectible billings from customer contracts	7,855,000												12,051
Net loss attributable to changes in bad debts and sales returns (in dollars per share)	$ 0.15												$ 0.09
Net loss attributable to changes of revenues in excess of billings	$ 1,308,000												$ 14,304,000