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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 255 $ 173
Finished goods 332 829
Inventory gross, Total 587 1,002
Allowance for excess inventory quantities (52) (52)
Inventories net, Total $ 535 $ 950