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The Company and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013
The Company and Summary of Significant Accounting Policies
Number of IC products developed	2mosy_NumberOfICProducts
Speed per second of high-speed interface technology of Bandwidth Engine ICs (in gigabits)	10mosy_HighSpeedInterfaceTechnologySpeedPerSecond
Allowance for Doubtful Accounts
Maximum specific allowance as percentage of invoice value for problematic customer balances	100.00%mosy_AllowanceForDoubtfulAccountsAsPercentageOfInvoiceValueForProblematicCustomerBalancesMaximum
Allowance for doubtful accounts receivable	$ 0us-gaap_AllowanceForDoubtfulAccountsReceivable	$ 0us-gaap_AllowanceForDoubtfulAccountsReceivable
Minimum
Property and Equipment
Estimated useful lives	3 years
Maximum
Property and Equipment
Estimated useful lives	5 years

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- Definition

Represents the maximum allowance for doubtful accounts provided for any problematic customer balances, expressed as a percentage of invoice value.

+ References

No definition available.

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- Definition

Represents the speed per second of the high-speed interface technology of Bandwidth Engine integrated circuits.

+ References

No definition available.

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- Definition

Represents the number of IC products.

+ References

No definition available.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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