Stockholders' Equity (Summary of Stock Option Activity) (Details) (USD $)	3 Months Ended
Mar. 31, 2013
Number of Shares
Outstanding - beginning balance	1,639,985
Granted	193,980
Exercised	(36,626)
Forfeited	(2,938)
Outstanding - ending balance	1,794,401
Expected to vest	1,776,457
Exercisable	1,392,012
Weighted Average Exercise Price Per Share
Outstanding - beginning balance	$ 6.38
Granted	$ 12.00
Exercised	$ 4.15
Forfeited	$ 9.16
Outstanding - ending balance	$ 7.08
Expected to vest	$ 7.08
Exercisable	$ 6.33

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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