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Subsequent Event - Additional Information (Detail) (Subsequent Event, USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended
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Jul. 12, 2013
Subsequent Event [Line Items] |
ADS issued in public offering, net proceeds | $ 121.1
American Depository Shares |
Subsequent Event [Line Items] |
ADS issued in public offering, number | 21,700,000
ADS issued in public offering, price per ADS | $ 5.60
ADS issued in public offering, net proceeds | $ 121.1
Options granted for purchase of additional shares | 3,255,000
Option,exercisable period | 30 days

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