Stockholders' Equity (Details 2) (USD $)	6 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Stock options
Stock Awards
Expiration period	10 years
Fair market value of common stock (in dollars per share)	$ 27.05	$ 30.34
Stock options \| Employees \| Minimum
Stock Awards
Vesting period	1 year
Stock options \| Employees \| Maximum
Stock Awards
Vesting period	4 years
Incentive stock options \| Individuals owning more than 10% \| Minimum
Stock Awards
Voting power of all classes of stock (as a percent)	10.00%
Incentive stock options \| Individuals owning more than 10% \| Maximum
Stock Awards
Expiration period	5 years
Incentive stock options \| 10% Stockholder
Stock Awards
Voting power of all classes of stock (as a percent)	10.00%
Incentive stock options \| 10% Stockholder \| Minimum
Stock Awards
Minimum exercise price as a percentage of fair market value (as a percent)	110.00%
2012 Equity Incentive Award
Stock Awards
Threshold number of annual additional shares of common stock available for issuance	1,512,687
Percentage for the threshold number of annual additional shares of common stock available for issuance, expressed as percentage of common stock issued and outstanding on last day of the preceding calendar year	4.00%
Number of shares authorized for grant	3,224,000	2,491,000

Represents the minimum exercise price, as a percentage of the estimated fair value.

No definition available.

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- Definition

Represents the fair value of the common stock of the entity.

+ References

No definition available.

+ Details

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- Definition

Represents the threshold number of annual additional shares available for future issuance under the equity-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage to be used for the threshold number of annual additional shares reserved for future issuance under the equity-based compensation plan, expressed as a percentage of common stock issued and outstanding on the last day of the preceding calendar year.

+ References

No definition available.

+ Details

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- Definition

Represents the voting power held, as a percentage of all classes of common stock.

+ References

No definition available.

+ Details

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- Definition

The period of time from the grant date until the time at which the share-based option award expires.

+ References

No definition available.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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