Cash and Cash Equivalents and Restricted Time Deposits	6 Months Ended
Jun. 30, 2017
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents and Restricted Time Deposits	Cash and Cash Equivalents and Restricted Cash and Time Deposits MRV accounts for highly liquid investments with an original maturity of 90 days or less as cash equivalents. Investments with original maturities at the date of purchase greater than 90 days and remaining time to maturity of one year or less as short-term and are included in restricted time deposits. MRV maintains cash balances and investments in qualified financial institutions, and at various times such amounts are in excess of federally insured limits. As of June 30, 2017 and December 31, 2016, the Company's U.S. entities held $18.0 million and $19.2 million in cash and cash equivalents. The remaining $6.3 million and $5.9 million as of June 30, 2017 and December 31, 2016, respectively, was held by the Company's foreign subsidiaries in foreign bank deposit accounts. Restricted time deposits represent investments that are restricted as to withdrawal or use and from time to time may include certificates of deposit. The investments in and releases of restricted time deposits are included in investing activities on the Company's Condensed Consolidated Statements of Cash Flows. As of June 30, 2017 and December 31, 2016, the Company had $4.9 million and $0.3 million of restricted cash and time deposits, respectively, primarily comprised of insurance proceeds received by the Company from its insurer in connection with the resolution of certain indemnification claims in addition to security deposits that are restricted due to their respective agreements. The insurance proceeds will be paid upon the satisfaction of certain conditions. (See Note 13, Indemnification Obligations)

Cash and Cash Equivalents and Restricted Cash and Time Deposits

MRV accounts for highly liquid investments with an original maturity of 90 days or less as cash equivalents. Investments with original maturities at the date of purchase greater than 90 days and remaining time to maturity of one year or less as short-term and are included in restricted time deposits. MRV maintains cash balances and investments in qualified financial institutions, and at various times such amounts are in excess of federally insured limits. As of June 30, 2017 and December 31, 2016, the Company's U.S. entities held $18.0 million and $19.2 million in cash and cash equivalents. The remaining $6.3 million and $5.9 million as of June 30, 2017 and December 31, 2016, respectively, was held by the Company's foreign subsidiaries in foreign bank deposit accounts.

Restricted time deposits represent investments that are restricted as to withdrawal or use and from time to time may include certificates of deposit. The investments in and releases of restricted time deposits are included in investing activities on the Company's Condensed Consolidated Statements of Cash Flows. As of June 30, 2017 and December 31, 2016, the Company had $4.9 million and $0.3 million of restricted cash and time deposits, respectively, primarily comprised of insurance proceeds received by the Company from its insurer in connection with the resolution of certain indemnification claims in addition to security deposits that are restricted due to their respective agreements. The insurance proceeds will be paid upon the satisfaction of certain conditions. (See Note 13, Indemnification Obligations)