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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Increased in valuation allowance tax $ 23,300 $ 9,200 $ 2,900
Net operating loss carryforwards, federal 68,800    
Net operating loss carryforwards, state $ 68,700    
Net tax operating losses, expiration Begin to expire in 2032 in various amounts if not utilized.    
Unrealized net operating loss deductions from stock option exercises, federal and state $ 8,900    
Unrecognized tax benefits 4,314 $ 1,643  
Unrecognized tax benefits if recognized would affect the effective tax rate $ 100