Stockholders’ Equity (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options outstanding at beginning of period	1,631,808
Granted	513,750
Exercised	(134,668)
Forfeited or expired	(39,616)
Stock options outstanding	1,971,269
Vested and expected to vest at end of period	1,909,670
Exercisable at end of period	1,318,440
Weighted Average Exercise Price per Share
Outstanding at beginning of period	$ 5.59
Granted (in dollars per share)	$ 15.26
Exercised (in dollars per share)	$ 4.18
Forfeited or expired (in dollars per share)	$ 28.94
Outstanding at end of period	$ 7.73
Vested and expected to vest at end of period	$ 7.60
Exercisable at end of period	$ 5.11
Weighted Average Remaining Contractual Term
Outstanding at beginning of period	4 years 6 months
Vested and expected to vest at end of period	4 years 6 months
Exercisable at end of period	3 years 918 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 9,274
Vested and expected to vest at end of period	9,167
Exercisable at end of period	$ 8,346

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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