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Related Party Transactions (Details) - Credo - USD ($) | 1 Months Ended | 12 Months Ended
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Feb. 29, 2012 | Dec. 31, 2016
Related party transactions |  |
Amount of loan provided by executive officers to related party | $ 250,000 |
Payment made to related party |  | $ 4,800,000
Initial amount of gross profits which will be retained by the entity |  | $ 3,500,000

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- Definition Represents the amount of loan provided by executive officers to related party as a portion of the seed funding. + References No definition available. + Details
Name: | mosy_RelatedPartyTransactionAmountOfLoanGivenByExecutiveOfficersToRelatedParty
Namespace Prefix: | mosy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of initial gross profits from the transactions with related party which will be retained by the reporting entity. + References No definition available. + Details
Name: | mosy_RelatedPartyTransactionInitialGrossProfitFromTransactionsWithRelatedPartyToBeRetained
Namespace Prefix: | mosy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mosy_CredoSemiconductorHongKongLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |