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Subsequent Event - Additional information (Detail) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended
Apr. 30, 2015
Subsequent Event [Member]
 
Subsequent Event [Line Items]  
Severance related to restructuring costs $ 0.5us-gaap_SeveranceCosts1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember