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Cash and Cash Equivalents and Restricted Time Deposits	9 Months Ended
Cash and Cash Equivalents and Restricted Time Deposits	Sep. 30, 2014
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents and Restricted Time Deposits	Cash and Cash Equivalents and Restricted Time Deposits MRV treats highly liquid investments with an original maturity of 90 days or less as cash equivalents. Investments with maturities of less than one year are considered short-term and are included on the balance sheet in restricted time deposits. MRV maintains cash balances and investments in qualified financial institutions, and at various times such amounts are in excess of federal insured limits.