Cash and Cash Equivalents, Restricted Time Deposits and Marketable Securities

3 Months Ended

Mar. 31, 2013

Cash and Cash Equivalents [Abstract]

Cash and Cash Equivalents, Restricted Time Deposits and Marketable Securities

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. MRV maintains cash balances and investments in qualified financial institutions, and at various times such amounts are in excess of federal insured limits.