Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income and Expenses [Abstract]
Interest income									$ 7mrvc_InterestIncomeNonoperating	$ 14mrvc_InterestIncomeNonoperating	$ 7mrvc_InterestIncomeNonoperating
Gain (loss) on foreign currency transactions									473	(336)	(316)
Other, net									(253)	(85)	255
Total	$ 387us-gaap_OtherNonoperatingIncomeExpense	$ 227us-gaap_OtherNonoperatingIncomeExpense	$ (420)us-gaap_OtherNonoperatingIncomeExpense	$ 33us-gaap_OtherNonoperatingIncomeExpense	$ (190)us-gaap_OtherNonoperatingIncomeExpense	$ (132)us-gaap_OtherNonoperatingIncomeExpense	$ (102)us-gaap_OtherNonoperatingIncomeExpense	$ 17us-gaap_OtherNonoperatingIncomeExpense	$ 227us-gaap_OtherNonoperatingIncomeExpense	$ (407)us-gaap_OtherNonoperatingIncomeExpense	$ (54)us-gaap_OtherNonoperatingIncomeExpense

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_OtherNonoperatingIncomeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration