Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Potential outstanding common stock
Employee stock purchase plan estimated share options outstanding (in shares)	68,595	97,333
Common stock options and restricted stock units ("RSUs") outstanding (in shares)	4,312,262	4,356,616
Common stock available for grant (in shares)	3,048,890	2,357,321
Common stock (in shares)	27,232,013us-gaap_CommonStockSharesOutstanding	26,271,593us-gaap_CommonStockSharesOutstanding	26,693,248us-gaap_CommonStockSharesOutstanding
Total (in shares)	34,661,760	33,082,863
Calculation of basic and diluted net loss per share
Numerator: Net loss (in dollars)	$ (69)	$ (4,122)
Denominator: Weighted average shares used in computing basic and diluted net loss per share	26,934,707	26,110,825
Basic and diluted net loss per share (in dollars per share)	$ 0.00us-gaap_EarningsPerShareBasicAndDiluted	$ (0.16)us-gaap_EarningsPerShareBasicAndDiluted

Represents the potential outstanding common stock held by the entity.

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- Definition

Represents the potential outstanding number of shares reserved for issuance under the share-based payment agreement.

+ References

No definition available.

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Represents the potential outstanding number of shares reserved for issuance pursuant to the employee stock purchase plan under the share-based payment agreement.

+ References

No definition available.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

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-Topic 505

-SubTopic 10

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-Topic 505

-SubTopic 10

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-Paragraph 30

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

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