Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Components of Property and Equipment (Detail)

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Property and Equipment - Components of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Total property and equipment, Gross $ 2,709 $ 2,552
Less: Accumulated depreciation and amortization (2,023) (1,740)
Total property and equipment, net 686 812
Computer and Office Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Total property and equipment, Gross 483 436
Laboratory Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Total property and equipment, Gross 1,703 1,593
Leasehold Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Total property and equipment, Gross $ 523 $ 523