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Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended		12 Months Ended
	Jul. 31, 2014	Feb. 28, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Proceeds From Issuance Of Common Stock And Warrant		$ 11,458
Proceeds From Sale Of Convertible Preferred Stock Common Stock And Warrants	15,000
Accumulated deficit			182,293	168,148
Net Income (Loss) Attributable to Parent			(14,145)us-gaap_NetIncomeLoss	(25,948)us-gaap_NetIncomeLoss
Working Capital			14,517mela_WorkingCapital
Cash and cash equivalents			$ 11,434	$ 3,783	$ 7,862

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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