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Stock Based Compensation - Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended |
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Mar. 31, 2015
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Dec. 31, 2014
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| Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward | ||
| Number of Shares Underlying Options, Outstanding at beginning of period | 4,765us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | |
| Number of Shares Underlying Options, Granted | 1,339us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | |
| Number of Shares Underlying Options, Exercised | (245)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | |
| Number of Shares Underlying Options, Forfeited | (88)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | |
| Number of Shares Underlying Options, Outstanding at end of period | 5,772us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 4,765us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
| Number of Shares Underlying Options, Vested and expected to vest - end of period | 5,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber | |
| Weighted Average Exercise Price Per Share, Outstanding at beginning of period | $ 7.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | |
| Weighted Average Exercise Price Per Share, Granted | $ 4.98us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice | |
| Weighted Average Exercise Price Per Share, Exercised | $ 4.28us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | |
| Weighted Average Exercise Price Per Share, Forfeited | $ 7.33us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | |
| Weighted Average Exercise Price Per Share, Outstanding at end of period | $ 6.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 7.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
| Weighted Average Exercise Price Per Share, Vested and expected to vest - end of period | $ 6.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice | |
| Weighted Average Remaining Contractual Term, Outstanding balance | 3 years 22 days | 2 years 7 months 13 days |
| Weighted Average Remaining Contractual Term, Granted | 4 years 11 months 5 days | |
| Weighted Average Remaining Contractual Term, Exercised | 0 years | |
| Weighted Average Remaining Contractual Term, Forfeited | 3 years 4 months 28 days | |
| Weighted Average Remaining Contractual Term, Exercisable at end of period | 3 years 22 days | 2 years 7 months 13 days |
| Weighted Average Remaining Contractual Term, Vested and expected to vest - end of period | 3 years 22 days | |
| Aggregate Intrinsic Value, Outstanding at beginning of period | $ 1,610us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue | |
| Aggregate Intrinsic Value, Outstanding at end of period | $ 1,610us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |
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- Definition
Share based compensation arrangements by share based payment award options exercises in period weighted average remaining contractual term. No definition available.
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- Definition
Share based compensation arrangements by share based payment award options forfeitures in period weighted average remaining contractual term. No definition available.
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- Definition
Share based compensation arrangements by share based payment award options grants in period weighted average remaining contractual term. No definition available.
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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- Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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