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Retirement Savings Plan - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Minimum age for eligibility to participate in the Savings Plan | 21 years |  |
Maximum contribution by the participants (as a percent) | 15.00% |  |
Matching contribution by the Company | $ 0 | $ 0 | $ 0

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- Definition Represents the maximum contribution to a defined contribution plan as a percentage of eligible earnings of employees, subject to a statutorily prescribed annual limit. + References No definition available. + Details
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Namespace Prefix: | mosy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the minimum age limit for participating in the defined contribution plan covering full-time and part-time employees of the entity. + References No definition available. + Details
Name: | mosy_DefinedContributionPlanRequiredAgeOfEmployeesToBeEligibleForParticipationInPlan
Namespace Prefix: | mosy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration