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Net Income (Loss) Per Share - Additional Information (Details) (RSU Vesting [Member])
12 Months Ended
Dec. 31, 2013
RSU Vesting [Member]
 
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Unvested RSUs 467,544us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember