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The Company and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 item	Dec. 31, 2014
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

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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.

+ Details

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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.

+ Details

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- Definition

Represents the number of IC products.

+ References

No definition available.

+ Details

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- Definition

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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