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Long-term contracts (Unbilled Contracts) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Long-Term Contracts Unbilled Contracts Details |  |
Billable within 30 days | $ 5 | $ 63
Billable between 31 and 90 days | 0 | 0
Billable after 90 days | 7 | 7
Total billable | $ 12 | $ 70

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- Definition The amount of unbilled receivables from customers under long-term contracts that have not been billed and are billable after 90 days of the balance sheet date. + References No definition available. + Details
Name: | mvis_BillableAfter90Days
Namespace Prefix: | mvis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of unbilled receivables from customers under long-term contracts that have not been billed and are billable within 31 and 90 days of the balance sheet date. + References No definition available. + Details
Name: | mvis_BillableBetween31And90Days
Namespace Prefix: | mvis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of unbilled receivables from customers under long-term contracts that have not been billed and are billable within 30 days of the balance sheet date. + References No definition available. + Details
Name: | mvis_BillableWithin30Days
Namespace Prefix: | mvis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | mvis_LongtermContractsServicesBillableDetailsAbstract
Namespace Prefix: | mvis_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of unbilled receivables from customers under long-term contracts that have not been billed and were not billable at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49336-109356 + Details
Name: | us-gaap_UnbilledReceivablesNotBillableAtBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant