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
Mar. 31, 2014
Mar. 31, 2013
Property Plant And Equipment [Line Items]    
Depreciation and amortization $ 157,000 $ 99,000