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Employee Benefit Plans - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract] |  |  |
Employee contribution to benefit plan | 15.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |
Employer contribution towards compensation | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |  |
Compensation contributed percentage | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Compensation expenses | $ 925 us-gaap_DefinedContributionPlanCostRecognized | $ 482 us-gaap_DefinedContributionPlanCostRecognized | $ 175 us-gaap_DefinedContributionPlanCostRecognized

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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