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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In connection with the sale by MRV of SPI in October 2010, MRV agreed to indemnify the buyer against certain claims brought after the closing for prior-occurring events. The Company has received a notice from SPI, advising the Company of a tax audit for periods including tax returns filed prior to the acquisition of SPI by the buyer. In April 2017, this matter was resolved and the Company recorded insurance proceeds received subsequent to March 31, 2017, in other current assets with a corresponding liability recorded in other current liabilities on the March 31, 2017, Condensed Consolidated Balance Sheet. All legal and other fees related to this matter were expensed as incurred, and MRV has recorded no provision for recovery of costs on this matter. MRV does not anticipate any further material impacts upon its business, operating results or financial condition related to this matter.