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Redeemable Convertible Preferred Stock - Additional Information (Detail) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Class Of Stock [Line Items] |  |
Accretion amount | $ 22 | $ 21

X
- Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of accretion of the preferred stock redemption discount during the period. + References No definition available. + Details
Name: | us-gaap_PreferredStockAccretionOfRedemptionDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration