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Stockholders' Equity/(Deficit) - Additional Information (Detail) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014 Incentive_Plan	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Investor	Mar. 31, 2013	Jan. 02, 2015	Jun. 03, 2010	Jan. 16, 2008	Aug. 17, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued	85,582,502us-gaap_CommonStockSharesIssued	83,882,577us-gaap_CommonStockSharesIssued		83,882,577us-gaap_CommonStockSharesIssued
Common stock, shares value representing payment for principal	$ 8,558us-gaap_CommonStockValue	$ 8,388us-gaap_CommonStockValue		8,388us-gaap_CommonStockValue
Warrants expiration date	Apr. 13, 2014
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding		0us-gaap_PreferredStockSharesOutstanding
Number of stock incentive plans	1omex_NumberOfStockIncentivePlans
Stock incentive plan expiration date	Aug. 17, 2007
Share-based compensation	2,081,482	2,582,009	1,657,800
Weighted average estimated fair value of stock options	$ 1.24	$ 1.42	$ 1.45	1.42
Aggregate intrinsic values of options exercisable	0	16,450	371,142	16,450
Aggregate intrinsic values of options outstanding	0	16,450	524,500	16,450
Aggregate intrinsic values of options exercised	0	183,000	14,475
Total fair value of shares vested	1,498,040	1,498,040	832,177
Total unrecognized compensation related to unvested share-based compensation awards	2,434,064
Weighted-average period	1 year 9 months
Employee Stock Incentive Plan [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, shares granted						1,652,000
Series D Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares issued	32,400	32,400		32,400
Preferred stock, shares outstanding	32,400	32,400		32,400
Conversion of preferred stock to common stock ratio	100.00%
Liquidation preference	$ 3.50
Convertible preferred stock description	Series D is convertible into common stock at a ratio of 1 to 1
Warrants Attached to Senior Convertible Debt [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase shares of common stock outstanding	1,562,500
Warrants exercise price	$ 3.60
Warrants expiration date	Nov. 09, 2016
Restricted Stock Units (RSUs) [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, shares granted						951,381
Warrants [Member] \| Series G Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of accredited investors to whom common shares were issued				5
Unvested Restricted Stock Awards Excluded from EPS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock, awards vested	911,641	854,861	1,286,257
Fair value of unvested restricted stock awards	1,158,684	380,013	514,964	380,013
Weighted-average grant date fair value of restricted stock awards	$ 1.43	$ 2.89	$ 3.91
Weighted-average remaining contractual term	3 years 7 months 6 days	2 years 10 months 21 days	3 years 10 months 28 days
Total unrecognized compensation cost related to unvested restricted stock awards	1,118,938
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued	1,290,155	3,552,357		3,552,357
Common stock, shares value representing payment for principal	$ 2,420,863	$ 9,280,242		9,280,242
Common shares issued from conversion of warrants	1,290,155	3,552,357	1,441,013	1,725,000	2,010,500
Warrants to purchase shares of common stock outstanding	0	1,725,000		1,725,000
Shares authorized for stock-based compensation							3,000,000	2,500,000	2,500,000
Exercise price of incentive option granted	Exercise price of any incentive option granted to an officer, director or eligible employee owning more than 10% of our outstanding common stock must not be less than 110% of fair market value on the date of the grant.
Common Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible employee threshold percentage	10.00%
Purchase price of common stock percentage	110.00%
Common Stock [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for stock-based compensation									500,000