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Inventory - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2013
Inventory [Line Items]        
Inventory write-down $ 100us-gaap_InventoryWriteDown $ 1,401us-gaap_InventoryWriteDown $ 287us-gaap_InventoryWriteDown  
Maximum        
Inventory [Line Items]        
Inventory write-down       $ 100us-gaap_InventoryWriteDown
/ us-gaap_RangeAxis
= us-gaap_MaximumMember