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Stockholders' Equity (Deficit) - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended		3 Months Ended
	Jan. 02, 2015	Mar. 31, 2015 Incentive_Plan	Mar. 31, 2014	Jun. 03, 2010	Jan. 16, 2008	Mar. 31, 2013	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued		89,582,502us-gaap_CommonStockSharesIssued					85,582,502us-gaap_CommonStockSharesIssued
Common stock, shares value representing payment for principal		$ 8,958us-gaap_CommonStockValue					$ 8,558us-gaap_CommonStockValue
Reverse stock split ratio		1-for-6
Preferred stock, par value		$ 0.0001					$ 0.0001
Preferred stock, shares authorized		9,675,200us-gaap_PreferredStockSharesAuthorized					9,675,200us-gaap_PreferredStockSharesAuthorized
Number of stock incentive plans		1omex_NumberOfStockIncentivePlans
Shares of common stock for reserved issuance		2,500,000
Stock-based compensation, shares granted	1,652,000
Share-based compensation		594,606	492,775
Weighted average fair value of options granted		$ 0.71	$ 1.28
Series AA-2 Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, par value		$ 0.0001
Preferred stock, shares authorized		86,677,740
Series AA-1 Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, par value		$ 0.0001
Preferred stock, shares authorized		101,124,042
Preferred stock Liquidation preference accretion rate		8.00%
Mako Resources, LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued		4,000,000
Common stock, shares value representing payment for principal		2,520,000
Oceanica Resources S. de. R.L [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares termination of option to acquire		6,000,000
Penelope Mining LLC [Member] \| Series AA-2 Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trading days		20 days
Minimum [Member] \| Penelope Mining LLC [Member] \| Series AA-2 Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of common stock		$ 1.26
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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, shares granted	951,381
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued			1,290,155			3,552,357
Common stock, shares value representing payment for principal			$ 2,420,863			$ 9,280,242
Common shares issued from conversion of warrants						2,010,500
Warrants to purchase shares of common stock outstanding		0
Additional shares authorized for stock-based compensation				3,000,000	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.
Stock incentive plan expiration date		Aug. 31, 2015
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 Awards and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for stock-based compensation		500,000