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Subsequent Events (Details) - Subsequent Event | Oct. 03, 2017 USD ($)
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M West Propco - Old Lessor [Member] |
Subsequent Event |
Termination fee | $ 250,000
Monthly rent expense | $ 88,930
Cyren Inc - New Lessor [Member] |
Subsequent Event |
Lease term | 36 months
Monthly rent expense | $ 21,600

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- Definition Operating Lease, Termination Fee + References No definition available. + Details
Name: | mosy_OperatingLeaseTerminationFee
Namespace Prefix: | mosy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CounterpartyNameAxis=mosy_MWestPropcoOldLessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CounterpartyNameAxis=mosy_CyrenIncNewLessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |