Annual report pursuant to section 13 and 15(d)

Income Taxes - Summary of Reconciliation of Expected Statutory Federal Income Tax Provision to Actual Income Tax Provision (Detail)

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Income Taxes - Summary of Reconciliation of Expected Statutory Federal Income Tax Provision to Actual Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Expected income tax benefit at federal statutory tax rate $ (3,424) $ (3,826)
Net operating loss reduction 4,441   
Change in valuation allowance (1,757) 4,668
State income taxes, net of federal benefit 583 (763)
Permanent items 555 54
Research credits (396)   
Other, net (2) (133)
Income tax (benefit) expense