Quarterly report pursuant to Section 13 or 15(d)

Property, Plant, and Equipment - Additional Information (Detail)

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Property, Plant, and Equipment - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 160,000 $ 116,000 $ 317,000 $ 215,000